Why do your pupils dilate when you look at someone

Explanation:

For starters, oxytocin and dopamine — the “love hormones” — have an effect on pupil size. Your brain gets a boost of these chemicals when you're sexually or romantically attracted to someone. This surge in hormones appears to make your pupils dilate. Dilation may also be related to the biological need to reproduce.

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;

what is the other part to the question