I believe that A would best state the main theme. It took Buck determination and perseverance to survive, so I would assume it would pay off. Hope this helps!
"Contrast" means to be different, or to differ. The answer is D. However, because "however" is used when you start to talk about something different.
I hope this helps! :D
Answer:
D. When you meet someone, you should say hello, smile, and shake hands.
Explanation: the answer was on quizlet, just so you know
Answer: It is (C) In an introductory paragraph of an essay
Explanation: Hope this helps!