Which percentage of american adults do not exercise on a regular basis?
a. 40%
b. 50%
c. 55%
d. 60%

The percentage of American adults who do not exercise on a regular basis is B. 50%, although the percentage is a little bit higher than that - around 52, but fewer than 55. So almost half of adults in America do not exercise and take care of their bodies the way they are supposed to if they want to be healthy and alive for a long time. This is a problem in America and people should be aware of the dangers that they lack of exercise entails.

The answer is b as in boy