Consider a Heat Pump That Operates on the Reversed Carnot

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 kPa and 800 kPa. The refrigerant changes from saturated vapor to saturated liquid during the heat rejection process. The net work input for this cycle is

A) 28 kJ/kg
B) 143 kJ/kg
C) 34 kJ/kg
D) 273 kJ/kg
E) 56 kJ/kg