A counter-flow heat exchanger is used to cool oil (c_p = 2.20 kJ/kg · K) from 110°C to 85°C at a rate of 0.75 kg/s by cold water (c_p = 4.18 kJ/kg · K) that enters the heat exchanger at 20°C at a rate of 0.6 kg/s. If the overall heat transfer coefficient is 800 W/m² · K, the heat transfer area of the heat exchanger is
(a) 0.745 m²

(b) 0.760 m²

(c) 0.775 m²

(d) 0.790 m²

(e) 0.805 m²