Final answer:
Without paragraph 10, it's speculative to ascertain Chiron's character traits, yet his mythological background suggests selflessness and honor, notably in nurturing roles like rearing Achilles.
Step-by-step explanation:
Without the specific actions described in paragraph 10, it is not possible to definitively determine which character trait of Chiron is being revealed. However, we can infer from the provided context that Chiron, as the teacher of Achilles and other Greek heroes, often showcases qualities aligning with selflessness and honor. In Greek mythology, Chiron is renowned for his wisdom and nurturing character, teaching young demigods and heroes not just warfare but also medicine, music, and prophecy, among other arts and sciences.
The context given mentions Chiron's role in hiding and rearing Achilles, suggesting protective and nurturing actions, which can be associated with selflessness. Hence, if Chiron's actions under consideration in paragraph 10 involve care, teaching, or protecting his pupils, especially in a difficult situation, then the correct answer would be 'D. Chiron's actions reveal his selflessness and honor.'