Answer: B. Semicircular canals
Explanation: Receptors of equilibrium are located in the middle part of the oval-shaped bone labyrinth located in the inner ear. This membrane labyrinth has three bony channels that contain perilymph in it. In them again lie the semicircular membrane channels and contain endolymph and containing receptors for equilibrium. Thus the purpose of the ear is not only good hearing but also a sense of balance.