28、 Your heart beats at the rate of 70 times per minute, each beat pumping about 60 cm³ of fluid against a pressure of 120 mmHg. How much expansion work does the heart do in a day? (Note: The heart work does much more work than this. The heart muscles are contracting, the blood is accelerated, and there are frictional losses and other factors involved.)
(A) 9.68×10¹ J
(B) 9.68×10² J
(C) 9.68×10³ J
(D) 9.68×10⁴ J