It Is Well Known That Participation in Regular Physical Exercise

It is well known that participation in regular physical exercise decreases with age.It is estimated that 38% of adults,18 to 24 years of age,participate in an adequate level of exercise to promote health and fitness.However,by 64 to 75 years of age,what percent of adults participate in a sufficient level of exercise?

A) 26%
B) 18%
C) 12%
D) Less than 5%