Which choice completes the text so that it conforms to the conventions of Standard English?
A
she
B
they
C
it
D
those
Explanation
Correct answer: C.
Choice C is the best answer. "It" is a singular pronoun used to stand in for objects. Since the antecedent in this case is the singular noun phrase "the human brain," "it" is a perfect pronoun to use here.
Why the other choices are wrong
Choice A
Choice A is incorrect. Although "she" is a singular pronoun, it is reserved for people and animals, not objects like "the human brain."
Choice B
Choice B is incorrect. "They" is a plural pronoun, but we need a singular pronoun to represent the antecedent "the human brain."
Choice D
Choice D is incorrect. "Those" is a plural pronoun, but we need a singular pronoun to represent the antecedent "the human brain."