Blaine just drove from outside where it was bright into a dark tunnel. When he entered the tunnel, his pupils
A) did not change at all.
B) got smaller (less open).
C) got bigger (more open).
D) quickly got bigger and then got smaller and stayed that way.

Question

Quizplus · Accepted Answer

When Blaine entered the dark tunnel, the amount of light entering his eyes decreased, causing his pupils to dilate (get bigger) in order to let in more light and improve his vision in the limited light conditions.

Blaine Just Drove from Outside Where It Was Bright into a Dark