Experts believe that senior citizens with higher than average cholesterol and their families develop a predisposition to cardiovascular disease are more likely to die at an age below that of their life expectancy.
a) and their families develop a predisposition to cardiovascular disease
b) whose families have a predisposition to cardiovascular disease
c) and a predisposition to cardiovascular disease runs in the family
d) whose families have a predisposition to cardiovascular disease running in them
e) with a predisposition to cardiovascular disease running in their family