A Heat Engine Produces $300 \mathrm{~W}$ Of Mechanical Power While Discarding $1200 \mathrm{~W}$

Multiple Choice

A heat engine produces $300 \mathrm{~W}$ of mechanical power while discarding $1200 \mathrm{~W}$ into the environment (its cold reservoir) . What is this engine's efficiency?

A) $\mathbf{0 . 2 0}$
B) 0.25
C) 0.33
D) Other (specify)