A refrigerator operates on the ideal vapor compression refrigeration cycle with R-134a as the working fluid between the pressure limits of 120 and 800 kPa. If the rate of heat removal from the refrigerated space is 32kJ/s, the mass flow rate of the refrigerant is
(a) 0.19 kg/s
(b) 0.15 kg/s
(c) 0.23 kg/s
(d) 0.28 kg/s
(e) 0.81 kg/s