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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
答案为什么是B? whose ---修饰pressure?
我觉得应在whose 前加个and. 请大家帮忙解释一下。
我选的是A。 | 
