Question

the opening in the center of the iris is the:
a pupil.
b retina.
c lens.
d conjunctiva.

Explanation:

The iris is the colored part of the eye. The pupil is the adjustable opening in the center of the iris that controls the amount of light entering the eye. The retina is the light - sensitive layer at the back of the eye. The lens is behind the iris and helps focus light. The conjunctiva is a thin membrane covering the front of the eye.

Answer:

A. pupil.