The major group of activities for improving crop yields can be classified as _______.

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Crop production improvement.

Crop protection management.

Crop variety improvement.

All of the above

answer is D.

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Detailed Solution

For A, choosing a crop variety that can produce a good yield is key. Breeding can be done to select for a variety of useful, desirable traits.
The improvement of B-crop output depends on a number of variables, including:
(i) knowledge of how plants grow and develop.
(ii) How different nutrients, the environment, and water affect plant growth.
(iii) Modifying and controlling each factor to raise the crop's yield
For-C, Protecting the crops from weeds, pests, rodents, dangerous pesticides, etc.
The three points listed above are the main categories of operations for increasing crop yields.

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