According to the Authors of Your Textbook, One of the Reasons

According to the authors of your textbook, one of the reasons that Nim Chimpsky did not use many signs may have been because:

A) Because he had the linguistic ability of a child at the stage of telegraphic speech
B) of a lack of practice and patience with the experimenters
C) of inappropriate (ineffective) reinforcement
D) of his reaction to being caged for extended periods of time