Which of the Following Clinical Changes Are Not All Associated

Which of the following clinical changes are not all associated with ageing?

A) reduced vulnerability to antigens, drug metabolism maintained at normal level, osteoporosis
B) enhanced oxygen saturation, impaired balance and risk of falls, increased risk of infection
C) drug metabolism maintained at normal level, reduced exercise tolerance, increased risk of infection
D) osteoporosis, fluid balance impaired, loss of high-tone hearing