A Person Is Walking Outdoors on a Cold Day When $- 20 ^ { \circ } \mathrm { C }$

A person is walking outdoors on a cold day when the temperature is $- 20 ^ { \circ } \mathrm { C }$ He is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales $0.0050 m ^ { 3 }$ of air. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature $\left( 37 ^ { \circ } \mathrm { C } \right)$ before it is exhaled? The specific heat of air is $1020 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K }$ and the density of air is $1.29 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

A) 300 W
B) 150 W
C) 60 W
D) 90 W
E) 100 W