The scientist discovered a process _______ could revolutionize renewable energy.

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Which choice completes the text so that it conforms to the conventions of Standard English?

A

who

B

whom

C

whose

D

that

Correct Answer: D

Choice D is the best answer. Use "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 C is incorrect because "whose" shows possession, not needed here.