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The discovery followed the investigation that the industrial chemical melamine, which is used normally to make plastics, had been added to powdered milk.
(A) The discovery followed the investigation that the industrial chemical melamine, which is used normally to make plastics
(B) The investigation follows the discovery that the industrial chemical melamine, which is used normally to make plastics
(C) The investigation followed the discovery that the industrial chemical melamine, which is normally used to make plastics
(D) The discovery followed the investigation that the industrial chemical, which is normally used to make plastics is melamine, and
(E) The investigation followed the discovery that the industrial chemical melamine is normally used to make plastics
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Correct answer: C
(A): Incorrect. (A) improperly swaps "discovery" and "investigation." First, "investigation that" is not an appropriate phrase. Second, the meaning of the sentence is that an investigation occurred due to a discovery. Further, the placement of "normally" is incorrect as it modifies "used" (i.e., that the use is normal) rather than "is" (i.e., that the use is typically).
(B): Incorrect because of the placement of "normally" as in (A).
(C): Correct
(D): Incorrect because of the placement of "investigation," as in (A). Also, (D) lacks a verb following "that" to describe the chemical, simply stating that "the industrial chemical ... and had been added."
(E): Incorrect. (E) changes the meaning of the sentence, suggesting that the discovery concerned the use of the chemical. Further, (E) illogically follows the verb "is" with "had been" with no conjunction: "The industrial chemical melamine is ... had been."