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.same as above
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
E.with a history of high blood pressure running in their family

OA: B

I was left with choice B and C. I eliminated B, because I thought that the construction, "studies show that young people with X whose Y " is wrong. shouldn't there be an "and" preceding "whose", as in, " ...people with X and whose families...." .

In choice B, whose immediately follows blood pressure. so, I feel that whose wrongly modifies blood pressure, indicating that it is the blood pressure whose families have a history.

Kindly let me know the correct explanation.

Thanx

I agree with you. Bear in mind, ETS does not make GMAT questions, so this was probably meant for another test. In that case, it's either a bad question, or it's based on another test's understanding of grammar. In either case, it's probably not the best study source for you for the GMAT.

Thank you for your time.

:)