A 1 m-inner diameter liquid oxygen storage tank at a hospital keeps the liquid oxygen at 90 K. This tank consists of a 0.5-cm thick aluminum (k = 170 W/m•K) shell whose exterior is covered with a 10-cm-thick layer of insulation (k = 0.02 W/m•K). The insulation is exposed to the ambient air at 20oC and the heat transfer coefficient on the exterior side of the insulation is 5 W/m2•K. The rate at which the liquid oxygen gains heat is
(a) 141 W
(b) 176 W
(c) 181 W
(d) 201 W
(e) 221 W
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