The Box on Attempts to Teach Language to Primates Concludes

The box on attempts to teach language to primates concludes that:

A) there is no difference between animal and human communication.
B) it is impossible to teach language-like behavior to primates.
C) while chimps can make simple associations between symbols and objects, they lack the ability to link symbols in complex sentences.
D) chimps can use language to guide their own behavior and to tell each other simple stories, and Washoe even spontaneously developed a language of her own.