During Adulthood, What Happens to the Body's Ability to Take

During adulthood, what happens to the body's ability to take in and transport oxygen to various body organs (VO₂ max) ?

A) When measured at rest, VO₂ max minimally declines with age, but during exercise, there is systematic decline of VO₂ max beginning between ages 35 and 40.
B) When VO₂ max is measured at rest, there is a systematic decline of about 1% per year, but during exercise there is minimal decline in capacity.
C) Primary aging causes an increase in VO₂ max during both rest and exercise, although the greatest increases are found during exercise conditions.
D) As women age, their VO₂ max decreases during rest and exercise conditions, but as men age, their VO₂ max improves under rest and exercise conditions.