The Ghana Empire increased greatly in size and wealth between 700 A.D. and 1100 A.D. How was the empire able to grow so powerful?
A.
by becoming the main source of water in the Sahara
B.
by controlling the trans-Saharan trade in gold and salt
C.
by controlling the trans-Saharan trade in gems and camels
D.
by becoming an ally of other empires in the Sahara