An Ideal Reversible Heat Pump Is Taking Heat from the Outside

Multiple Choice

An ideal reversible heat pump is taking heat from the outside air at -10.0°C and discharging it into the house at 18.0°C. What is the coefficient of performance of this heat pump?

A) 0.533
B) 10.4
C) 0.644
D) 0.0962
E) 9.44