On a Cold Winter Day, the Outside Temperature Is -20°C

Multiple Choice

On a cold winter day, the outside temperature is -20°C and the inside temperature is maintained at 20°C. There is a net heat flow to the outside through the walls, roof, etc., of 25 kW. What is the rate of increase of the entropy of the universe as a result of this?

A) 13 W/K
B) 25 W/K
C) 85 W/K
D) 99 W/K
E) 0 W/K