Chantek the Orangutan Is One of Many Nonhuman Primates That

Chantek the orangutan is one of many nonhuman primates that scholars have used to draw conclusions about the origins of human language because they seem to be able to learn how to do what?

A) communicate through drawing
B) communicate through sign language
C) speak a handful of basic English words
D) speak to other nonhuman primates with their own spoken language