The medical record shows that it was the drug,not the disease,___killed him two years ago

he medical record shows that it was the drug.the effect of which
B.which
C, not the disease,___killed him two years ago
A.the effects of it
D.that
这个答案是D 我的语法书上说了that是只能用在限制性定语从句的 为什么还是选择了D呢

强调句
it was ... that 句型 强调是the drug而不是the disease
not the disease是插入部分
并不是非限定语从句

.。去除it was,句子仍然成立强调句....that，这里所强调的是宾语从句的主语

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