Which of these is a case of selective breeding?

Over time, more milk cows at the diary farm began to produce larger amounts of milk.

A gene was identified that increased milk production. This gene was added to calves in the womb.

To increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mothers.

The genome of a group of cows was analyzed to identify the gene for milk production.

C. To increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mothers.

Explanation:

Selective breeding is a process in which breeding animals are chosen by the human in order to produce a desired character organisms. This new organism is far better than their parents because it has good characteristics of both male and female organism. In these organisms, one good trait is present in male and one good trait is present in female but the offspring that is produced from it has both good traits. So that's why it is better than its parents.