The term "aerobic exercise" (first line in second last paragraph)is a kind of ______.

A．Executives tend to ignore doctors' advice and warnings.
B．Executives are sensitive to pressure from the younger generation.
C．All chief executives can earn millions of dollars a year.
D．Executives are careful of what they eat.

A．they can conduct their business
B．they can indulge themselves
C．they can cultivate their mind
D．they can exercise as well as socialize