I might get a 1-star answer for this
Posting replies will not help the bullying. It will only make him more aggressive because you annoyed him with replies. You can just consult an adult instead of typing replies. Your known adult could help you. So, just take the part out where you post a reply online. I wouldn't recommend seeing them in real life, but it is encouraged to stand up to the bully. So, (B) She should not post a reply online