A perfect heat pump supplies heat to a building so that the temperature is 27 ° C. The cold reservoir is river water at 7 ° C. What is the power delivered heat to the building if the electric power of the compressor is 1 kW? 

Select the correct answer from the following list: 

a) 2.86 kW 

b) 3.85 kW 

c) 1.35 kW 

d) 14 kW 

e) 15 kW