I tried taking the Mensa practice test. One of the question involved completing a series of figures with the most logical option. This is the base sequence:


And we have to choose the additional figure from these four options:

Four Options

I chose correctly, but admittedly did it mostly intuitively. I'd like to understand why the correct answer is:

Option 2: The three small black triangles

The only reasoning I could come up with seems dubious at best:

Alternance of shapes and lines; avoiding repeating figures; first two figures don't have angles, third does, so fourth should too.

Is there an obvious explanation that I'm missing here?

Reference to the full test (requires to provide an email address for results): http://mbe.webfactional.com/members/cgi-bin/preTest/preTest_v3.cgi?lang=fr

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    $\begingroup$ Looks to me like it's just a bad question. $\endgroup$
    – f''
    Jun 13 '16 at 14:43
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    $\begingroup$ I've VTC as "primarily opinion-based" because 3 random pictures does not make a pattern : answers will be based more on opinion than logic $\endgroup$
    – Fabich
    Jun 13 '16 at 16:06
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    $\begingroup$ Wow, that's a horrible question. $\endgroup$
    – Deusovi
    Jun 13 '16 at 16:06
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    $\begingroup$ @Lordofdark I agree that the IQ-test question itself is worthy of closure, but the question here is actually a good one: "Please explain to me why this puzzle's solution is what it is." It's completely within the scope of this site. (There's even a tag for it: explanation.) $\endgroup$
    – GentlePurpleRain
    Jun 13 '16 at 20:12
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    $\begingroup$ This isn't a matter of opinion. The triangles are the most logical. Each of the other 3 options are mirror images of the 3 figures in the sequence. $\endgroup$ Jun 13 '16 at 21:48

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