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Extreme pressure in the sea is the energy source that resulted in compression of tiny sea creatures into fossils, over millions of years. These creatures got buried under the ocean or river sediments, and the pressure caused their compression, leading to the formation of oil and natural gas.

Of the following given choices;

a. nuclear

b. coal

c. oil

d. geothermal

The answer is; C.

When dead plankton settles at the bottom of the oceans and seas and gets compressed by accumulating layers of sediments over centuries and millennia, they turn to crude oil due to the high pressure and heat.