Suppose That, in Iceland, Scientists Discover Geothermal Vents That Produce $300^{\circ} \mathrm{C}$

Multiple Choice

Suppose that, in Iceland, scientists discover geothermal vents that produce pressurized steam at $300^{\circ} \mathrm{C}$ . Engineers construct a heat engine that uses this steam as a hot reservoir and a nearby glacier as a cold reservoir. What is the maximum possible efficiency of this engine?

A) $300 \%$
B) $100 \%$
C) $52 \%$
D) $45 \%$
E) $22 \%$
F) Other