Answer:
The correct answer would be a directional selection.
Directional selection is a type of natural selection in which the extreme phenotypes are selected or favored over the intermediate value or phenotype.
It shifts the frequency of allele towards the extreme phenotype being favored.
AN example may include industrial melanism in which light peppered moths were selected before the industrial revolution and dark-colored peppered moths were selected after the industrial revolution. No intermediate color was selected at any time.
