After the death of Alexander the Great, the Greek empire declined because A.
children caught numerous diseases.
B.
nomadic tribes invaded the land.
C.
generals fought with each other.
D.
communities migrated to new lands.

After the death of Alexander the Great, the Greek empire declined because:

C.  generals fought with each other.

Explanation:

Born in 356 BCE, Alexander the Great was a Greek king famous for conquering most of the known world (of his day). He was also considered a military genius, known as well for his courage and diplomatic skills. However, once the great king died, his empire ended up declining. His death left a gap in power, so his generals began fighting one another to obtain it. The empire was, thus, divided among Alexander's generals instead of remaining united.

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