Which of the Following Contributed to the Declining Power of the Egyptian

Which of the following contributed to the declining power of the Egyptian pharaohs by 2400 B.C.E.?

A) Rivalry over land and water created a number of warring city-states.
B) Egypt was defeated in a series of wars with invaders from the east.
C) Egyptian pharaohs adopted a policy of seclusion.
D) Local officials and nobles assumed greater authority.