(1) is the volume of blood contained by the ventricles at the end of an atrial contraction. And the volume of blood remaining in the ventricle when the aortic and pulmonary trunk valves close at the end of ventricular systole is known as the (2)

A. (1) end diastolic volume; (2) end systolic volume

B. (1) end diastolic volume; (2) stroke volume

C. (1) end systolic volume; (2) end diastolic volume

D. (1) stroke volume; (2) end diastolic volume