Which of the following inventions helped boost agricultural yields beginning in the twelfth century?

Question

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The iron plow, which was introduced in the twelfth century, helped farmers to till the soil more effectively and increase agricultural yields. The stirrup was important for horse riding, but did not directly impact agriculture. The grain mill was important for grinding grain, but did not lead to higher yields. Artificial fertilizer was not invented until the nineteenth century.

Which of the Following Inventions Helped Boost Agricultural Yields Beginning