I think the answer is c. Sentence 3
Sorry if wrong
In any story, or a specific one?In general, a protagonist is the main character, the person who takes the center-stage in a story. For example, Katniss in the Hunger Games, or Holden Caulfield in the Catcher in the Rye
it gives your average person a sense of hope
It depends on what you need it for, if you have a lot of things that you need to pin up so you don't loose them one would be great. If you don't well then it might not be for you...