The coefficient of performance of a refrigerator is 5 . If the insi...

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The coefficient of performance of a refrigerator is 5 . If the inside temperature of freezer is \( -20^{\circ} \mathrm{C} \), then the temperature of the surroundings to which it rejects heat is
(a) \( 41^{\circ} \mathrm{C} \)
(b) \( 11^{\circ} \mathrm{C} \)
(c) \( 21^{\circ} \mathrm{C} \)
(d) \( 31^{\circ} \mathrm{C} \)
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