The sentence in question is: "Linnaeus, concerned exclusively with similarities in bodily structure, faced only the problem of distinguishing H. sapiens from apes, (C) differ from humans in numerous bodily as well as cognitive features".
We are looking for a relative pronoun that connects "apes" to the clause describing how they differ from humans.
I. which (Correct):
"Which differ from humans..." is grammatically and contextually correct when referring to apes (non-human animals). It introduces a non-restrictive relative clause.
II. whom (Incorrect):
"Whom" is used for people as the object of a verb or preposition (e.g., "the person whom I met"). Apes are not people, and they are the subject, not object, of the verb "differ".
III. whose (Incorrect):
"Whose" shows possession (e.g., "the ape whose fur was brown"). Here, we are not indicating possession but introducing a clause about difference.
Thus, option (e) is the correct answer.