Which of the following is an example of natural selection?

A. To produce a more desirable fruit, a farmer crosses a tree that produces sweet oranges with a tree that produces large oranges.

B. Cricket frogs prefer to sleep during the day, while red-eyed tree frogs prefer to sleep during the night.

C. Pesticides are sprayed in a field, resulting in an increase in crop growth and a decrease in insect population.

D. Rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.