Who overthrew the pharaohs? slaves plebeians babylonians priests

The Egyptian empire began to crumble in the 6th century B.C. when it was first attacked by the Babylonians. However, the Pharaohs were officially wiped out when the Persians killed Pharaoh Psamatik III. 

Since this is a multiple choice question, I would choose C, Babylonians.

Answerseafloor spreading;

Exploration mission 2;