A heat pump is absorbing heat from the cold outdoors at $$5^\circ C$$ and supplying heat to a house at $$22^\circ C$$ at a rate of 18,000 kJ/h. If the power consumed by the heat pump is 2.5 kW, the coefficient of performance (COP) of the heat pump is :

A

0.5

B

1.0

C

2.0

D

5.0