A 20-cm-diameter hot sphere at 120°C is buried in the ground with a thermal conductivity of 1.2 W/m·K. The distance between the center of the sphere and the ground surface is 0.8 m and the ground surface temperature is 15°C. The rate of heat loss from the sphere is
(a) 169 W
(b) 20 W
(c) 217 W
(d) 312 W
(e) 1.8 W
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