Verified Answer :

The primary energy source in the US is fossil fuels, such as coal and oil. Hydroelectic and solar are very very small in comparison (about 10 to 15 times less of those is used than fossil fuels).

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Answer:

C. Fossil Fuel

Explanation:

Fossil fuels are the main or primary US energy source. But because of it's negative effects it brings, scientists are trying to find out a better source to replace it.  

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