Final answer:
d) Ciliary body; iris. The ciliary body controls the shape of the lens, while the iris controls the size of the pupil.
Step-by-step explanation:
The smooth muscle that controls the shape of the lens is the ciliary body, while the smooth muscle that controls the size of the pupil is the iris.
The ciliary body is a smooth muscle structure on the interior surface of the iris that controls the shape of the lens through the zonule fibers.
The iris is a pigmented, circular muscle at the front of the eye that regulates the amount of light entering the eye. It constricts the pupil in response to bright light and dilates the pupil in response to dim light.