Which of the following systems of farming is farming whereby farmers grow only what they need to survive? subsistence farming commercial farming sedentary farming nomadic pastoralism

The correct answer is SUBSISTENCE FARMING.
Subsistence farming is a type of farming method in which the farmer cultivate crops that is sufficient to take care of themselves and their families only. This type of farming focus on getting sufficient foods for the farmers' needs only and during the harvest period the farmers do not sell any of their harvested crops, they use it as food instead.

I'm pretty sure it's c. extremely gradual but not 100% sure though.

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