Which of the Following Has Been Argued by Critics of Ape

Which of the following has been argued by critics of ape language research?

A) Ape language is merely imitation of the trainer's behavior.
B) There is little evidence that apes can equal even a 3-year-old's ability to order words with proper syntax.
C) By seeing what they wish to see, trainers attribute greater linguistic ability to apes than actually exists.
D) All of these are arguments by critics.