The sides of the Iran nuclear negotiation reached a key point, the result of would have a

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A. that
(答案→)B. which
C. whom
D. them
解析：先行词为“negotiation”，所填的词又要作介词“of”的宾语，故只能用关系代词“which”。
The result of which=of which the result=whose result。句意：伊朗核武器多边谈判已经到了一个关键点上，谈判的结果将会对世界和平产生巨大的影响。