I’m sure that you have told him will make some to his decision.A. what; differenceB. that;

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(答案→)A. what; difference
B. that; difference
C. which; effect
D. what; effect
解析：考查主语从句和固定词组。第一空what引导主语从句what you have told him在句中做tell的宾语。第二空是固定词组make some difference起作用，有影响；句意：我敢确信你告诉我的事情会对他的决定起一些作用。故A正确。