Why did Cortés enlist the Tlaxcalans and the Totonac to help defeat the Aztec?

O Cortés used the Tlaxcalans and the Totonac to help him fight the Aztec because he wanted them to run his New world territories after he left.
O The Tlaxcalans and the Totonac could help lure Aztec forces into a false sense of security by offering tribute.
O The Tlaxcalans and the Totonac were eager to get out from under the self-imposed rule of the Aztec.
O Cortes needed their help because he knew that his military technology was not strong enough to defeat the
Aztec.

The most accurate answer is: Cortés needed their help because he knew that his military technology was not strong enough to defeat the Aztec. By enlisting the Tlaxcalans and the Totonac, Cortés was able to have additional manpower and support in his efforts to conquer the Aztec empire. The Tlaxcalans, in particular, were long-standing enemies of the Aztec and were eager to ally themselves with Cortés in order to gain their freedom from Aztec rule.