Prior to modern times, knowledge of the human body was limited for which of the following reasons?

A. There was general ignorance of the body because Christians prohibited the dissection of corpses.
B. The medical schools relied on animal dissection, and this resulted in misinformation, since animal bodies differed from human bodies.
C. The ancient Greek thinkers Aristotle and Galen were the supreme authorities, and they were often incorrect.
D. All these answers are correct.

D