A dynamic character is a character who changes a significant amount internally from the start of the story to the end of the story. A is the only option where the character changes significantly internally.
When you have a dynamic character they usually undergo a change throughout the course of the book. With Teddy, he changes from being angry after losing to realizing that winning is not as important as having fun with friends and working together
"He could have made Tybalt love the Capulets" is the best response since in the ancient scripture and myth Cupid is all powerful in this sense--even giving power to gods.
