Question

practice it pigmented, circular muscle in the eye that regulates the size of the pupil iris violet lily ivy daphne

Explanation:

The iris is the pigmented, circular muscle in the eye that controls the pupil's size. Violet is a color, Lily is a flower, Ivy is a plant, and Daphne is a name (also a plant genus). Only iris matches the anatomical description.

Answer:

A. iris