Alexander Was Aided in His Conquest of Egypt By

Alexander was aided in his conquest of Egypt by:

A) being proclaimed as the "son of Ammon" by the sun god's oracle.
B) turning his attention toward Egypt only after conquering Persia.
C) his mother's family who were members of the Egyptian royal family.
D) a civil war in Egypt between the joint rulers,Cleopatra and Ptolemy.
E) the use of "Greek Fire," recently invented by Archimedes.