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
此處whose是修飾前面的young people，是否whose可以跳躍修飾？就which不可以呢?
有时候which也可以，这个问题很复杂。。。介就是gmat讨厌的地方，没有确定的规则
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