To get the best from their produce, farmers tend to alter the features of the crops they have presently. The phenomenon that explains the action taken by the farmers above is;
Artificial Selection is the process of choosing desirable traits from plants and animals with the view of getting a new generation that is healthier and that possesses much better features.
In the case of the farmers above, they effected artificial selection by suppressing flower development in the wild mustard plant thus giving rise to broccoli which had more desirable features.
Therefore, the answer, artificial selection is correct.
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