Scientists Believe That Ape Communication Through Gesturing Represents

Scientists believe that ape communication through gesturing represents

A) a clear use of complex rules of language on par with adult communication in humans.
B) a simple form of conditioning that can be demonstrated in the lab.
C) a form of complex communication that is unrelated to human language.
D) a form of communication that may represent a starting point for human language.
E) a form of communication having surprising complexity that can be likened to a computer language.