Depressors of Mandible -: (A) Median pterygoid, (B) Masseter, (C) Lateral pterygoid, (D) Temporalis
Answer is C. Depressors of the mandible are:-


Muscle of mastication: Lateral pterygoid (major depressor).
Suprahyoid muscles: Digastric, mylohyoid, geniohyoid.


Elevators of the mandible are:-


Muscles of mastication: Masseter, temporalis, medial pterygoid.