The best response to cyberbullying is C. Confide in an adult you trust such as a teacher or parent.
Speaking with a trusted adult can provide the support and guidance needed to handle the situation effectively. They can help you develop a strategy for addressing the bullying and ensure your safety. Other options, such as confronting the bully or retaliating, can often escalate the situation and may not lead to a positive resolution. Writing an email may not be effective either, as it doesn't guarantee that the bully will respond positively.