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!
The correct answer is; "What proof the tripster is able to provide".
That´s because as a reporter, he must make sure about the authenticity of the accusation as he cannot post apocryphal news.
Remember, theme is "TheMessage" in the story. Grab supporting details that could include "because, as, etc." That explain some specific action happening. Always look for the cause and effect in the stories. When you explain in detail, you write "and this supports the theme of the story because (your answer here). Remember to start your conclusions with "Therefore, So on and so forth, In conclusion, etc." Hope I helped! (:
Conventions are a way something is done.
