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C.

Explanation:

The pupil reflex is the reflex contraction and relaxation of the antagonistic muscles of the iris in response to changes in light intensity. It causes a change in the pupil size. The pupil dilates at low light intensities, and constricts at high light intensities.

The picture below shows how the muscles are relaxed and contracted. Hope this helps:]

there’s no image attached but i can if you want: )

b.have there own function.