Unlike the automobile company, whose research was based on crashes involving sport utility vehicles, the research conducted by the insurance company took into account such factors as a driver's age, sex, and previous driving record .
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Acompany, whose research was based on
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Bcompany, which researched
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Ccompany, in its research of
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Dcompany's research, having been based on
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Ecompany's research on
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正确答案: E