Incomplete question. However, I inferred from a general literature perspective.
Answer:
D. The dragon and the princess became lasting friends.
Explanation:
Remember, the climax of a story may in most cases refer to the most intense point of a story leading to the resolution of the story. Or may refer to the poin in the development of a story where there's a sudden change of action leading to a solution provided.
Thus, in a convention plot style the statement "the dragon and the princess became lasting friends" makes a good climax.