What Was the Occupation of the Overwhelming Majority of Peasants

What was the occupation of the overwhelming majority of peasants, and the foundation of Egypt's great wealth?

A) raising cattle and goats for meat.
B) agriculture in the pursuit of food products.
C) trading with other parts of the world.
D) becoming career members of Egypt's large army and being paid by the spoils of conquest.
E) working as government bureaucrats like tax collectors and census takers.