Which of the Following Statements Is Incorrect

Which of the following statements is incorrect?

A) The lateral pterygoid muscle inserts on both the articular capsule and the articular disc of the temporomandibular joint.
B) Acting together, the lateral pterygoid muscles protrude the mandible.
C) The masseter muscle has a superficial and a deep head.
D) The medial pterygoid muscles elevate and protrude the mandible.
E) The fibers of the medial pterygoid muscle lie at right angles to those of the masseter muscle.