Which story is an example of a fable?
A. An arrogant king learns a lesson about being humble when he's tricked into appearing without clothes.
B. A young husband sells his most prized possession in order to buy his wife a gift, not knowing that his wife has done the same thing for him.
C. A hare loses a race to a tortoise because he is overconfident, and he learns an important lesson as a result.
D. A young boy discovers that honesty is the best policy when a lie leads him on a dangerous adventure.