Studies Where Researchers Have Attempted to Teach Language to Non-Human

Studies where researchers have attempted to teach language to non-human animals have generally found that:

A) chimpanzees and gorillas are the only animal species that can fully learn language.
B) some animals are capable of learning elements of human language, but they have not convincingly demonstrated human-like language use.
C) animals are incapable of learning even the most basic elements of human language.
D) dolphins are the only animal species that can fully learn language.