Entropy: 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. At what rate is the entropy of the air outside the house changing as a result of this process?
A. +13 W/K
B. -25 W/K
C. 85 W/K
D. +99 W/K
E. 0 W/K
Answer: D
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