These are examples of artificial selection.
'Artificial selection' is a process in which the breeder choose to perpetuate only those forms that have certain desirable inheritable characteristics.
The other three options are incorrect as; mutation is a sudden change in DNA sequence due to mutagenic agents such as chemicals and radiations.
Natural selection is a gradual process by which biological traits become either more or less common in a population as a function of the effect of the changing environment.
Reverse evolution or devolution is a notion that species can change into more primitive forms over time.

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