Industrial melanism in the peppered moth $(Biston \text{ } betularia)$ is an example of:

• A
  Natural selection where the darker form is favoured in polluted areas.
• B
  Mutation where the dark form is produced by repeated irregular mutations.
• C
  Artificial selection where the light form is favoured in industrial areas.
• D
  Genetic drift where the dark form is lost in non-polluted areas.