Suppose You Are Trying to Design a Personal Fan That $\left(37^{\circ} \mathrm{C}\right)$

Multiple Choice

Suppose you are trying to design a personal fan that you wear on your head and operates between your body temperature $\left(37^{\circ} \mathrm{C}\right)$ and room temperature $\left(22^{\circ} \mathrm{C}\right)$ . What is the maximum possible efficiency of this device?

A) $170 \%$
B) $95 \%$
C) $54 \%$
D) $46 \%$
E) $5 \%$
F) Other (specify)