Which of the following was NOT used as a source of power by medieval farmers?

Name: Which of the following was NOT used as a source of power by medieval farmers?
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Coal was not used as a source of power by medieval farmers. It was not until much later, during the Industrial Revolution, that coal became a popular source of energy. Farmers relied on animals such as horses and oxen to plow fields, as well as water and windmills to power mills and grind grains.

Which of the Following Was NOT Used as a Source