Many economists believe that advertising helps increase competition ______ leads to lower
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Many economists believe that advertising helps increase competition, ______ leads to lower prices, thus benefiting consumers and the economy as a whole.
A．what
B．that
C．when
D．which
请帮忙给出正确答案和分析，谢谢！
更新中~-
正确答案：D
定语从句题。关系代词which可引导非限定性定语从句，指代句子内容。本题which指代advertisinghelpsincreasecompetition，故选项D正确。