Looks like:
The count of distinct things in a row/column adds up to 7 (so a different letter or style counts as 1 but only once in a row)
So if we apply that to the row and column our questionable tile is on:
Row 3 has D,A,circle,line and box - five distinct things. Column 1 has D,C,B,box and circle - again five distinct things.
And then:
We find that none of those answers fit (I think) because they're repeated. Option 1 gives no new options to the row and only adds one to the column. 2 adds 1 to row and none to column. 3 gives one to row and one to column. 4 gives one to row and one to column. Either way we don't get the extra two we need. The answer would have to be something like B,triangle, line for this to work. Ah well...back to the drawing board. I was so convinced every row and column adding to 7 was relevant...
Old answer:____________
A potential rule:
We have letters and styles, each row/column either repeats a letter or repeats a style but won't repeat both.
Applying that:
Row 3 has two Ds and an A so we need a C or B without one of the other styles - The B in a box fits this. This also fits for column 1