A Major Criticism of the Early Language Studies with Chimpanzees

Multiple Choice

A major criticism of the early language studies with chimpanzees was that

A) the chimps did not demonstrate humor or emotional statements within their communications.
B) even untrained chimps use simple gestures to communicate with humans.
C) the chimps were unable to use conditional statements when communicating.
D) the chimps were unable to use American Sign Language or lexigrams.