Which of the Following Statements Is Accurate About Physical Development

Which of the following statements is accurate about physical development during middle adulthood?

A) During middle adulthood, reaction time decreases, whereas bone density increases.
B) During middle adulthood, the basal metabolic rate increases, whereas lean-body mass increases.
C) During middle adulthood, lung capacity decreases, whereas body mass index increases.
D) During middle adulthood, lung capacity increases, whereas reaction time decreases.