I have no clue in doing this questions
It has traditionally been thought that all biological functions decline with age, but according to the National Institute on Aging, certain important capabilities, such as the output of the heart under stress and intellectual vigor
, remain essentially unchanged
B. the heart's output under stress and intellectual vigor
C. intellectual vigor and the output of the heart under stress
D. intellectual vigor and the effect of stress on the heart's output
E. the effect of stress on the heart's output and intellectual vigor
"Life is like a box of chocolates, you never know what you'r gonna get"