The primary energy source of the early industrial revolution

The primary source or energy was coal. During this time, steam-powered engines with coal-fueled boilers were used to power trains and ships for many things.

The primary source of energy during the Industrial Revolution was coal, from coal-burning power plants.

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i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

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i think the answer is b.