Why Does the Study of Ape Language Capabilities Advance the Understanding

Multiple Choice

Why does the study of ape language capabilities advance the understanding of human language?

A) Apes have at least some of the capabilities of language, which helps us better understand the evolution of human language.
B) Apes are capable of everything short of verbal language, which helps us improve communication with deaf people.
C) It is clear that apes can only mimic human sign language, which indicates that human language is truly unique to our lineage.
D) Ape language abilities are closer to humans than to other primates, which adds to our knowledge of the human family tree.