In Adulthood, When Maximum Oxygen Uptake and Cardiac Output Are

In adulthood, when maximum oxygen uptake and cardiac output are measured at rest, what is the usual age-based pattern? When maximum oxygen uptake and cardiac output are measured during exercise, what is the typical age-based pattern?

A) At rest, there is a systematic decline of about 10% per year. During exercise, there is minimal decrement in capacity.
B) During adulthood there is minimal age-based decrement in capacity of either of these functions when they are measured at rest or during exercise.
C) Significant measures of age-based decline are found during rest, and even greater measures of decline in functioning are observed during exercise.
D) Neither of these functions show significant declines when measured at rest, but when measured during exercise, both functions show systematic age-based declines.