What muscle forms the labia of the mouth and controls most lip movement

The correct answer will be-Orbicularis oris muscle

Explanation:

The muscle which is present in the mouth is known as the oribicularis oris which consists of various muscular fibres in a different direction.

The oris muscle is derived from the other facial muscles inserted into the lips and join with the lips controlling the movement of the lips. The muscle controls the movement by pulling down the corners of the mouth and the lips along with other muscles like the mentalis,  the triangularis and the risorius.

Thus, Orbicularis oris muscle is the correct answer.