Lack of exercise produces the same or similar bodily effects as aging. In fact, the physical changes that accompany aging can often be slowed down by appropriate exercise. No drug, however, holds any promise for slowing down the changes associated with aging. Ttherefore, __. Which one of the following provides a logical completion to the passage above? ['people who do not exercise when they are young will gain few benefits from beginning to exercise at a later age', 'appropriate exercise can prevent the physical changes associated with aging', 'if the physical changes of aging are to be slowed, it is more practical to rely on exercise than on drugs', 'people who do not exercise are likely to need drugs to sustain their health']