Which of the Following Is False with Respect to the Harvard

Which of the following is false with respect to the Harvard Alumni Health Study?

A) Men who participated in university sport did not have a lower risk of CHD unless they maintained a high level of physical activity
B) Energy expenditure in physical activity was inversely associated with CHD risk
C) Active men had a lower risk of CHD in the presence and absence of other major risk factors
D) Very high levels of physical activity were associated with an elevation in CHD risk