Question ID:PT22 S4 Q11 Passage:Even though apes are the only nonhuman creatures able to learn human language, no ape has ever used its human language skills to ask such philosophical questions as, "How am I different from all other creatures?"  Therefore, philosophical thought is unique to humans. Stem:The conclusion in the passage above relies on which one of the following assumptions? Correct Answer Choice:CChoice A:Human language is unique to humans. Choice B:Apes are incapable of thinking in human language. Choice C:Philosophical thought can be expressed only in human language. Choice D:Speaking in human language is easier than thinking in human language. Choice E:It is more difficult to learn human language than to express philosophical questions.