Faced with difficulties, you should believe your confidence is makes a difference.A. wha

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(答案→)A. what
B. that
C. which
D. whether
解析：考查表语从句：句意：面对困难，我们应该相信你的自信是产生影响的东西。Is后面是宾语从句，表语从句中缺少主语，what可以在宾语从句中做主宾表，that引导表语从句的时候，不做成分，which哪个，whether是否，不符合句意。选A。