A 10-m-long 5-cm-outer-radius cylindrical steam pipe is covered with 3-cm thick cylindrical insulation with a thermal conductivity of 0.05 W/m·K. If the rate of heat loss from the pipe is 1000 W, the temperature drop across the insulation is
(a) 163°C

(b) 600°C

(c) 48°C

(d) 79°C

(e) 251°C