Answer:
Option (A)
Step-by-step explanation:
Directional selection is usually defined as a type of natural selection method where the genetic variance of a particular population moves towards a new type of phenotype due to their exposure to the frequent changes that occur in the environment.
This method leads to a decreasing rate of genetic variability. In nature, this method results in the evolutionary trend of a population towards one particular end of the trait spectrum.
Thus, the correct answer is option (A).