大全987-675 答安对吗?

1.       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

没有停顿, 豆号, whose 能着么加上去吗?     Studies show that young people with higher-than-average blood pressure, whose families have a history of high blood pressure, are more likely than others to develop a severe form of the condition.

请指教

原文没加逗号,先认为可以吧.

跳跃修饰

whose修饰的是young people

这题我也对B有点疑问

主语+介宾+定从  之间没连词是否会有问题？

这题我对B不满意

为什么这道题可以跳跃修饰呢？