For a Certain Ideal Carnot Engine, the Hot Reservoir Is $35 \mathrm { C } ^ { \circ }$

Multiple Choice

For a certain ideal Carnot engine, the hot reservoir is $35 \mathrm { C } ^ { \circ }$ higher than the cold reservoir. If this engine is to have an efficiency of $20 \%$ , what must be the temperature of the hot reservoir?

A) $245 \mathrm {~K}$
B) $210 \mathrm {~K}$
C) $70.0 \mathrm {~K}$
D) $140 \mathrm {~K}$
E) $175 \mathrm {~K}$