Inversion and eversion are special movements of the

A) forearm and hand.
B) mandible.
C) sole of the foot at the ankle joint.
D) thumb toward or away from the other fingers.
E) the knee joint.

Inversion and eversion are special movements of the sole of the foot at the ankle joint. The terms refer to movement of the foot inwards or outwards, respectively, at the ankle joint. Therefore, option C is the correct answer. The other options are incorrect because forearm and hand movements are related to supination and pronation; the mandible is related to elevation and depression, protraction and retraction, and lateral and medial excursions; thumb movements are related to opposition and reposition, and the knee joint is related to flexion and extension.