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Can somebody tell me what's the answer on this puzzle? And why?

a busy cat

Thanks!!

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    $\begingroup$ Welcome to Puzzling! This is not a [logic-puzzle]; please check the tag wiki before using a tag. $\endgroup$ – Deusovi Jul 27 '16 at 13:29
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    $\begingroup$ The literal answer to your question would be "Yes. Because people here are smart." since you asked "Can somebody tell me?". But probably not the answer you were looking for. $\endgroup$ – Floris Jul 27 '16 at 13:37
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    $\begingroup$ Hope you're not asking from the examination hall :P $\endgroup$ – ABcDexter Jul 27 '16 at 17:27
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    $\begingroup$ Are you sure it's OK to repost the question here? $\endgroup$ – WBT Jul 28 '16 at 0:39
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    $\begingroup$ For some reason that domain is blocked at the place I'm working. Can you please upload that picture via upload feature(to i.stack.imgur)? $\endgroup$ – Lafexlos Jul 28 '16 at 16:08
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+100
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It is

C

Because the third column

is the difference between the first and second column

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    $\begingroup$ Also works if you look at rows instead of columns. $\endgroup$ – The Dark Truth Jul 27 '16 at 13:37
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    $\begingroup$ Ha - that's surprising but true. $\endgroup$ – Floris Jul 27 '16 at 13:38
  • $\begingroup$ Easier to see and two direction variant of the puzzle puzzling.stackexchange.com/questions/38009/… $\endgroup$ – z100 Jul 27 '16 at 15:24
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Answer is

C

Because of

XOR operator, applied on columns. Read more about XOR operator here

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    $\begingroup$ Hello, and welcome to Puzzling.SE! It is customary to hide your answer with spoiler tags >!. Also, adding a duplicate answer is typically frowned upon unless you can demonstrate a substantially different method of getting there than has been previously mentioned. $\endgroup$ – feelinferrety Jul 27 '16 at 18:03
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    $\begingroup$ +1 because, except the edit, the answer is good.. but a bit developer way... you may explain XOR $\endgroup$ – lemon Jul 27 '16 at 18:07
  • $\begingroup$ Added documentation link for XOR operator. $\endgroup$ – Ashish Jain Jul 27 '16 at 20:33
  • $\begingroup$ The XOR principle was covered in earlier answers and comments. $\endgroup$ – Prune Jul 27 '16 at 22:51
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    $\begingroup$ This is the cleanest and most specific answer, and an improvement to the previous. $\endgroup$ – pipe Jul 28 '16 at 8:51
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Correct Answer is

C

Explanation:

Each column and row has exactly 2 circles.
Each of the four corners appears an even number of times in each column or row.

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    $\begingroup$ It looks more to me like you take both pictures, stack them on top of each other, and remove any overlap $\endgroup$ – Areeb Jul 27 '16 at 13:33
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    $\begingroup$ @Areeb Different wording but same effect. $\endgroup$ – The Dark Truth Jul 27 '16 at 13:35
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    $\begingroup$ Or you could say "XOR the shapes", I believe this sums it up perfectly. $\endgroup$ – Anton Jul 27 '16 at 17:39
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It is

C

Because :

It works by column, and the third picture depends on the two first.
On the last symbol of the line, you add the symbols of the first and second pictures. If a form (triangle or circle) is present twice, you remove it. Else, you leave it. For example, for the first column : You add the first picture :
(1 triangle at the top right corner and 1 at the top left corner, and 1 circle at the middle), and the second one :
(1 triangle at the top right corner, 1 at the bottom left corner, 1 at the bottom right corner, 0 circle in the middle), so you get : 1 triangle at the top left corner, 2 at the top right, 1 at each bottom and 1 circle, so you just remove the top right one and it gives you the picture at the third line of column number 1.

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I think it is simpler - It is

E

I see two rules:

1. If you scan the rows from the top in rows (vertically) or horizontally in columns, there is a rule that there are always two black solid circles in every row. So we are missing something with a solid black circle, possible answers are A, C, E.
2. All of the solid black circle symbols can be paired off as mirror images of each other, like this:
(a) the bottom left symbol is a mirror image of the middle one in the far right column.
(b) The one in the middle of the top row, is a mirror image of the one in the centre of the middle row.

Following this rule, the un-paired solid black remaining is the one at the top left. A mirror image of this is symbol E.

I'm assuming the three white square symbols (with no solid black circle), are just distractions/noise.

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    $\begingroup$ Never assume that there is "noise" in these puzzles. $\endgroup$ – Floris Jul 27 '16 at 17:08

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