A new energy source found in the ocean that is currently very costly to obtain?

A. Methane hydrates

B. Petroleum

C. Plankton

I believe the correct answer from the choices listed above is option A. A new energy source found in the ocean that is currently very costly to obtain would be methane hydrates. Although the high cost, it represents a potentially vast methane resource for both the United States and the world. Hope this answers the question.