The Coefficient of Performance (COP) of a Refrigerator Is Defined

The coefficient of performance (COP) of a refrigerator is defined as the ratio of

A) the heat removed from the inside to the heat expelled to the outside.
B) the heat expelled to the outside to the heat removed from the inside.
C) the heat removed from the inside to the work done to remove the heat.
D) the heat expelled to the outside to the work done to remove the heat.
E) the difference between the heat expelled to the outside from the heat removed from the inside to the work done to remove the heat.