Which following examples represent a flat character

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.

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i believe the dynamic character would be teddy because he learns an important lesson