SAS Similarity (Side-Angle-Side Similarity, SAS~)
How to solve SAS similarity problems: theorem, example, and its solution.
If two corresponding sides of two triangles are proportional
and if the included angles of those two triangles are congruent,
then those two triangles are similar.
Draw the two triangles to prove its similarity:
△APQ and △ABC.
△APQ and △ABC have the same angle (red).
And AQ/AC = 2/5.
Then, to use the SAS similarity,
AP/AB has to be 2/5.
AP/AB = AQ/AC = 2/5.
So the answer is
C AP/AB = 2/5.