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Which is common to the formation of all fossil fuels?

A. Once-living organisms are converted into carbon-rich fuels
B. Swampy forest plants are converted into carbon-rich fuels.
C. Fossils are converted into carbon-rich fuels.
D. Sedimentary rock is converted into carbon-rich fuels.

User Kaznovac
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C. Fossils are converted into carbon-rich fuels.

User Istos
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