The answer is the 3rd picture not including the question picture. (the one that had the number 90 degrees in it.)
When you look at the order of the marked angles, only that one matches.
Say that the angle marked with 1 line is angle 1, 2 line is angle 2, etc.
Angle 1-->angle 2-->90 degree angle-->angle 3
Only the third choice fits even though it only labeled 3 angles, but because the sums of all angles in any quadrilateral is 360, it is easy to indicate that the unlabelled angle is angle 1.
Hope the explanation makes sense.
