ANS:B - refrigeration obtained to the work required.

The Coefficient of Performance (COP) of a refrigerator is the ratio of refrigeration obtained to the work required. In other words, it is the ratio of the amount of heat energy removed from the refrigerated space (refrigeration effect) to the amount of work input required to achieve this cooling. Mathematically, the COP of a refrigerator is expressed as: COP=Refrigeration effectWork inputCOP=Work inputRefrigeration effect​ A higher COP indicates that the refrigerator is more efficient, as it is able to remove more heat energy from the refrigerated space for a given amount of work input.