Studies show that young people with higher-than-average blood pressure and their families have a history of high blood pressure is 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 high blood pressure running in them
E with a history of high blood pressure running in their family
答案是B, C为啥不对？
a history of high blood pressure runs in the family 与 higher-than-average blood pressure 并列，共同作with 的宾语，修饰young people
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