Answer is A. Desirable traits can be selected for and bred in offspring.
Charles Darwin found that there are variations among the individuals of the same species depending on the specific location. These variations may occurred may be due to environmental factors such as availability of food resources, climate differences, and predator-prey relationships.
The experiment with breeding pigeons was aimed to duplicate natural selection through artificial selection. As a result new trait was developed over a period of time. Therefore, desirable traits can be selected and bred in offspring.