Answer: C. through the characters' experiences and thoughts.
Explanation: When you see how the character reacts to the situations, and what happens as a result, you can see a moral indirectly presented. For example in the tortoise and the Hare, you can see how the hare thinks he has enough time to nap. Meanwhile the tortoise passes him and wins. When a character has doubt in their thoughts and does something based on those doubts, we can see a moral. For example, someone doubts a person by how they are dressed, and then judges them simply based on this. Going hand in hand with the moral "Don't judge a book by it's cover"