Which option best illustrates an improvement in technological understanding?

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A farmer's child attends an agricultural university and later helps on the farm.A farmer employs an additional laborer for daily work.A farmer purchases an extra tractor for the farm.A farmer learns that planting crops in spring yields better results than planting in autumn.

Explanation

Option D reflects an advancement in technological knowledge because the farmer gains insight into optimal planting times, enhancing farming efficiency. The other options involve labor or equipment changes without representing new technological understanding.