Sue Savage-Rumbaugh Reported That Kanzi, an 8-Year-Old Bonobo, a Great

Sue Savage-Rumbaugh reported that Kanzi, an 8-year-old bonobo, a great ape similar to a chimpanzee but genetically and behaviorally closer to humans, learned to use symbols to communicate with a grammatical complexity similar to that of

A) a 12-year-old gorilla.
B) a 20-year-old chimpanzee.
C) a 2-year-old child.
D) a 5-year-old child.
E) human beings around the time that speech first took hold roughly 150,000 years ago.