Answer:
11. D. It put him in situations where he had to turn to his animal instincts to survive
12. B. Exposition (I'm not sure about this one. If it's wrong please tell me, it's my bad)
13. A. True courage cannot be learned
14. C. "Buck stood and looked on, the successful champion, the dominant primordial beast who made his kill and found it good"
Explanation:
Hope this helps :)