The beneficial effects of digitalis in congestive heart failure result in part from the fact that digitalis causes. A decrease in end-diastolic volume
b. A decrease in end-diastolic pressure
c. An increase in stroke volume and cardiac output
d. A decrease in central venous pressure
e. A decrease in rate of the hear where tachycardia exists

(a) and (c) only

(c) and (d)

(e) only

All of the above

(a), (b) and (c)