Air Is Flowing Steadily Through a Cooling Section Where It

Air is flowing steadily through a cooling section where it is cooled from 30°C to 15°C at a rate of 0.25 kg/s. If the average COP of the air-conditioner is 2.8 and the unit cost of electricity is $0.07 per kWh, the cost of electricity consumed by this air-conditioner per day (a period of 24 hours) is

A) $2.26
B) $17.73
C) $6.33
D) $6.78
E) $1.62