The domesticated camel, which some scholars date around the twelfth century B.C., was the key to the
development of the spice trade in the ancient world.

a. The domesticated camel, which some scholars date
b. The domesticated camel, which some scholars have thought to occur
c. Domesticating the camel, dated by some scholars at
d. The domestication of the camel, thought by some scholars to have occurred
e. The camel's domestication, dated by some scholars to have been

OA D
Doubt: Why is E wrong ?