Respuesta :
b) A spoiled rich teenager learns humility after working with the homeless.
The sentence that refers to a dynamic character is B) A spoiled rich teenager learns humility after working with the homeless.
A dynamic character is a character that experiences an importante change throughout a story. Moreover, his change usually affects his/her personality or attitude. It is the case of the character in sentence B) since he/she becomes humbler thanks to his/her experience, that is to say after working with the homeless. On the other hand, sentences A), C) and D) do not refer to a dynamic character.