A Unique Aspect of the Ancient Ethiopian Civilization Was the Fact

A unique aspect of the ancient Ethiopian civilization was the fact that

A) it was the only Muslim society in the area.
B) it adopted the form of Christianity practiced in Egypt.
C) its assimilation by Kush was brought about through the development of trade ties.
D) it became a Muslim nation because of the Syrians.
E) it remained animist in religion until the twentieth century.