Which of the following is the cause of stroke volume increase during intense physical activity

Question

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During intense physical activity, the demand for oxygen and nutrients increases, leading to an increase in the volume of blood returning to the heart (venous return). This increased volume stretches the cardiac muscle, leading to an increase in the end-diastolic volume. As a result, the cardiac muscle fibers generate more force during the contraction phase, which leads to an increase in stroke volume. Elongation of filling time (B) can also be a contributing factor, but it is primarily caused by the increase in end diastolic volume (A). An increase in heart rate (C) may lead to an increase in cardiac output but not necessarily an increase in stroke volume. A decrease in venous return (D) would lead to a decrease in stroke volume.

Which of the Following Is the Cause of Stroke Volume