这是非限定性定语从句，which指代前面的整个句子“科学家们有一个重大发现”，当然如果把逗号去掉就是限定性定语从句，which就指代“发现”。对于这句话来讲，用不用逗号意思上都基本正确。但是如果用了逗号，非限定性定语从句的先行词就只能用which，而不能用that（B选项）。所以加个逗号应该是为了考察B选项吧。A项的语序不符合定语从句先行词在前的规则，D选项it是多余的，如果用it就表明后面是一句...
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