One of the controversies surrounding America's energy markets is the trade-off between energy production and clean air.Assuming clean air has value, the United States will be on its production possibility frontier if and only if:
A.resources used to produce clean air and energy are not being fully utilized.
B.pollution is eliminated.
C.the price of energy is relatively low.
D.resources used to produce clean air and energy are being fully utilized.

Question

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The Answer of One of the controversies surrounding America's energy markets is the trade-off between energy production and clean air.Assuming clean air has value, the United States will be on its production possibility frontier if and only if:
A.resources used to produce clean air and energy are not being fully utilized.
B.pollution is eliminated.
C.the price of energy is relatively low.
D.resources used to produce clean air and energy are being fully utilized.

One of the Controversies Surrounding America's Energy Markets Is the Trade-Off