Which Statement Accurately Describes the Influence Exercise Has on the Resting

Which statement accurately describes the influence exercise has on the resting cardiac output?

A) An athlete has about the same resting cardiac output as a healthy untrained person of the same size because when the stroke volume increases the heart rate will decrease.
B) An athlete has a higher resting cardiac output than a healthy untrained person of the same size because both stroke volume and heart rate increase as a result of training.
C) An athlete has a lower resting cardiac output than a healthy untrained person of the same size because both stroke volume and heart rate decrease as a result of training.
D) An athlete has about the same resting cardiac output as the healthy untrained person of the same size because stroke volume decreases and heart rate increases once the exercise stops.