If a bully bothered me at school, I would first ignore it. Then if the bullying gets worse, I would ask him/her to stop politely(be patient with bullies they are having a hard time, and thats why they are most likely picking on you). If it doesn't stop I would report it to an adult, or a parent. It will stop after this, if it doesn't then talk to the bullies' parents or the principal
You could do the basic answer and say stop using skinny models use all sized models to prove that nobody is perfect but your all beautiful
Answer: I think it it is D because it is the most polite and shows that you understand that the other person feels differently.