Choose the one alternative that best completes the statement or answers the question. -An external heat source supplies heat to a system at a rate of 187 W as the system

Choose the one alternative that best completes the statement or answers the question.
-An external heat source supplies heat to a system at a rate of 187 W as the system does work at a rate of 131 W. At what rate is the internal (thermal) energy of the system changing?
A) -320 W
B) -56 W
C) 190 W
D) 320 W
E) 56 W

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