Which of the following is an example of natural selection?

Question

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Pesticides are sprayed in a field, resulting in an increase in crop growth and a decrease in insect population.
Cricket frogs prefer to sleep during the day, while red-eyed tree frogs prefer to sleep during the night.
To produce a more desirable fruit, a farmer crosses a tree that produces sweet oranges with a tree that produces large oranges.
Rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.

Answer 1

Rabbits with a mutation for longer, thicker fur surviving an unusually cold winter, while many normal rabbits do not survive, is an example of natural selection.