What Led Researchers to the Conclusion That Regular Physical Activity

What led researchers to the conclusion that regular physical activity over a lifetime may overcome the effects of inherited risk?

A) Death rates have continued to decline among lifetime exercisers.
B) Twin studies have shown active people are less likely to die early than inactive people.
C) Cardiovascular diseases are less prevalent among active twins than inactive twins.
D) It is not possible to overcome a family history of disease.