D is not your answer. Someone who is bitter and exhausted has learned something that made them bitter and exhausted. They have changed.
C is not your answer. We have a hook here. We're drawn in to find out why she is different. That's not a flat character.
A is not your answer. These twins have a conflict. It is a natural way to develop a story.
B as charming as he sounds, his charm and wit lead us nowhere. He is a foil for the main character. Our pleasure in him is only momentary. B is the answer.
Hunger Games. It is full of action, and is better than the movie. Or... Warrior's, if you like fiction, adventure and action, but Hunger Games is my personal fave.
The correct answer is letter C: <span>Funny sidekick.</span>
You wont have a paper acceptable for any school or job that you may need to write a proper essay or something.
