sat 语法题Although the exact cause of type2 diabetes is unknown

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sat 语法题
Although the exact cause of type2 diabetes is unknown,experts say that for some people improper diet and lack of 【exercise contribute】 to the onset of disease.
A.原句
B.exercise,they contribute
C.exercise contributes
请问.为什么选a?不选B,

在选项B里面,exercise和they是一个东西,所以主语重复了.
选项C里,contribute这个动词加了s表示主语是单数,但这里主语有两个,improper diet和lack of exercise.所以动词应该是原型,contribute.

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