Study of the Function of the Living Human Brain in the Past

Multiple Choice

Study of the function of the living human brain in the past was difficult because

A) it is difficult to induce brain damage in humans for the purpose of research.
B) brain damage is uniform from case to case.
C) brain damage is too common.
D) researchers have to wait for the natural death of a brain-damaged human.
E) by the time researchers obtain a brain, it has undergone significant degradation.