Choose the one alternative that best completes the statement or answers the question. -Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP)

Choose the one alternative that best completes the statement or answers the question.
-Suppose that the Department of Energy develops a new reversible engine that has a coefficient of performance (COP) of 4.0 when operated as a refrigerator and a COP of 5.0 when operated as a
Heat pump. What is its thermal efficiency when operated as a heat engine doing work?
A) 80%
B) 20%
C) 25%
D) 10%
E) 45%

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