During Middle Adulthood, How Can One Compensate for the Physical

During middle adulthood, how can one compensate for the physical changes associated with aging?

A) Exercise can compensate for muscle loss by causing growth of new muscle cells.
B) Regular exercise can offset much of the age-related loss in lung capacity.
C) Vigorous exercise can help regain the prowess of a young adult athlete.
D) Eliminating simple carbohydrates can block age-related loss of lean-body mass.