A) sustainable, less polluting, and about 3 times as efficient as heating a home using electricity from a coal-fired power plant.
B) sustainable, slightly more polluting, and is about 30% more efficient than using electricity from a coal-fired power plant.
C) not sustainable but is less polluting and is about as efficient as using electricity from a coal-fired power plant.
D) not sustainable and actually pollutes more than using electricity from a coal-fired power plant.
Correct Answer: A
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