The chart shows data for four heat engines.
Heat Engine
W
Х
Y
Z
Th (K)
620
840
900
500
T. (K)
120
100
300
25
Which lists the engines from most efficient to least efficient?
OY, X, W, Z
OZ, W, X, Y
OZ, X, W, Y
OY, W, X, z
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