Feudalism originally developed because A
the king needed serfs to work his fields.
B
more food was needed after the bubonic plague.
the knights went to fight the Crusades.
D
people needed protection from invaders.

Examine this list of events that took place in china during the 20th century. which event or events could possibly have been a cause of the great leap forward? a. i only b. i, iii, and iv c. i and iii d. iii and iv