Consider a heat pump that operates on the reversed Carnot cycle with R-134a as the working fluid

Question:

Consider a heat pump that operates on the reversed Carnot cycle with R-134a as the working fluid executed under the saturation dome between the pressure limits of 140 and 800 kPa. R-134a changes from saturated vapor to saturated liquid during the heat rejection process. The net work input for this cycle is
(a) 28kJ/kg
(b) 34kJ/kg
(c) 49kJ/kg
(d) 144kJ/kg
(e) 275kJ/kg