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

KEY: B

请问B的whose为什么不会有修饰blood pressure的歧意?

A和C又错在哪呢?

young people ... and their families have a history of high blood pressure

你看一名词能和一句子并列么？

blood pressure 没有所有格形式，所以 whose 不修饰它。