A Carnot heat pump for domestic heating works between a cold system ( the contents of refrigerator cabinet) at \(0^{\circ} \mathrm{C}\) and the water in the radiator system at \(80^{\circ} \mathrm{C}\). The coefficient of performance of this heat pump would be about:

(a) 1.4

(b) 3.4

(c) 4.4

(d) 6.2