The Temporalis and Masseter Muscles Close the Jaw While the Platysma

The temporalis and masseter muscles close the jaw while the platysma opens the jaw.To clench your teeth,you

A) contract the temporalis and masseter and relax the platysma.
B) relax the temporalis and masseter and contract the platysma.
C) contract the temporalis, masseter, and platysma.
D) relax the temporalis, masseter, and platysma.
E) contract the temporalis and relax the platysma and masseter.