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Why did farmers let some fields lie fallow?

A.
to reduce the surplus of crops
B.
to bring new land under cultivation
C.
to increase the soil's productivity
D.
to allow serfs to grow their own food

C. to increase the soil's productivity

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The correct answer is C. to increase the soil's productivity. Farmers let some fields lie fallow to give the soil a period of rest and recovery. This practice allows the soil to replenish its nutrients, which leads to increased productivity in the long run. When a field is constantly planted with crops year after year, it can deplete essential nutrients, leading to lower yields over time. By allowing the field to lie fallow, farmers are able to restore the fertility of the soil, making it more productive and ensuring better harvests in the future.