Which of the following features is a characteristic of West African mosques?

a. strong, local, and quarried stone
b. battered walls that slope inward toward the top
c. projecting wooden beams called torons
d. square or circular plans

c. projecting wooden beams called torons (Toron, a wooden beam that projects from exterior walls; provides permanent supports for wooden scaffolding erected each year so the exterior of the mosque can be replastered.)