1. Where is the pupillary sphincter located? __ A. the wrist B. the eye C. the ankle

## Step 1<br />The pupillary sphincter is a part of the eye. It is a ring of smooth muscle that controls the size of the pupil, which is the opening in the center of the iris that allows light to enter the eye.<br />## Step 2<br />The pupillary sphincter is not located in the wrist or the ankle. These are parts of the body that are not directly involved in the function of the eye.<br />## Step 3<br />Therefore, the correct answer is B. the eye.