Which change would best aid a farmer in making the transition from conventional farming techniques to more sustainable farming techniques?

The correct answer is -  Rotate the types of crops grown.

Explanation:

Crop rotation is the practice of growing the different types of crops sequentially on the same field to improve nutrients in the soil for better soil health and helps in fighting pest and weed pressure.

Different crops required different nutrients and therefore, rotating crops helps to not exploiting the same nutrients again and again. Rotating crops also helps in removing weeds and pests as different weeds and different pests associate with different crops.

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there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: