Which of the following interpretations is consistent with results of many studies to teach human language to animals?

A) Animals cannot learn to associate particular words, signs, and symbols with specific meanings.
B) Animals can learn human language, but prefer not to.
C) Animals can learn to communicate with symbols and signs, but there is not clear evidence that they can combine these symbols into complex phrases.
D) Animals raised with humans from birth can learn language just as easily as a human child.

Answer: C
Rationale: Apes communicate only with symbols, not with syntax, as humans do. The majority of apes produce single signs, a couple of signs strung together, or apparently random sequences.