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In 2018, the greatest, and hence most important, source ofenergy for the entire world was _______. A. petroleum and other liquids (i.e., oil) B. natural

In 2018, the greatest, and hence most important, source ofenergy for the entire world was _______.

A. petroleum and other liquids (i.e., oil)

B. natural gas

C. nuclear

D. coal

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