The correct response is (D). Faulty construction obscures the meaning of this sentence. The sentence begins with a subordinate clause, whose subject is “a building’s structure.” However, the subject of the main clause, “it,” appears to refer back to “structure.” However, a careful reading reveals that “it” is used two times: "it" is intended to refer to the “level of earthquake resistance” the first time and to the “building’s structure” the second time. The
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