Trevon works long hours at a desk. He knows that he needs a more active lifestyle to be healthy, but his job is very demanding. Starting an intense exercise program on top of everything else seems like too much. What would be the BEST way for Trevon to change his habits?

A.
He should start by making small changes, like short walks during lunch.

B.
He should design a daily exercise regime that requires getting up an hour early every day.

C.
He should recognize that this is a busy time and plan an exercise routine when his job is less demanding.

D.
He should change all of his unhealthy habits at once to maximize the health benefits of these changes.