Then the correct answer, in my opinion, is C. Spitz's actions. Spitz is not a round character. We don't get to delve into his thoughts much, simply because he is an alpha dog whose only goal is to confirm his strength and authority through aggression. So, he fights Buck a few times, as well as any other dog that would threaten his position.
The lines would be read with passion and emphasis. “No Santa Claus! Thank God!” should be read with great volume, emphasis, and emotion. Explanation: hope this helps :)