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Answer:
D. Americans need to work harder to become less dependent on coal, oil, and gas for our increasing energy needs.
Explanation:
The above was the right answer to the question. This is because, despite the facts that Americans are willing to switch to using alternative energies, but they are still heavily dependent on the non-renewable energy sources.
There is need for them to work hard towards separating themselves from becoming increasingly dependent on such energy sources that are non renewable like coal.