Question

Which of the following is an example of inbreeding?
a)A farmer chooses the cows in his or her herd that produce the most milk and breeds only those cows.
b)A farmer chooses the cows in his or her herd that produce the most milk and breeds them with cows that get sick less often.
c)A farmer chooses the cows in his or her herd that produce the most milk and injects them with hormones that make them produce more milk.
d)A farmer chooses the cows in his or her herd that produce the most milk and pulls them out of the breeding stock.