The phenomenon _______ scientists have studied for decades remains unexplained.
7
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
who
B
whom
C
that
D
whose
Correct Answer: C
Choice C is the best answer. "That" for things in restrictive clauses.
Choice A is incorrect because "who" is for people. Choice B is incorrect because "whom" is for people. Choice D is incorrect because "whose" shows possession.