9. Studies show that young people with higher-than-average blood pressure and their families have a history of high blood pressure are more likely than others to develop a severe form of the condition.
(A) and their families have a history of high blood pressure
(B) whose families have a history of high blood pressure
(C) and a history of high blood pressure runs in the family
(D) whose families have a history of high blood pressure running in them（B）
(E) with a history of high blood pressure running in their family
C错误的原因是and前后不对称。但是当时我觉得and后省略了with，现在想来，是不是with是不可省的？
不错。
而且即使不考虑这个，将c改成你想要的样子，逻辑意思也有问题。
with a history of high blood pressure in the family
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