... Let's name them A, B, C, D.

A told B that C is telling a lot of people shits about D. So B informed D to warn him about C. A also added he isn't scared because he is telling the truth.

When D asked C why he do that, C is totally lost and swear that he didn't do it.

So, C asked A nicely, why is he spreading fake rumours? A denied any knowledge on this matter and said that he had not contact B for quite some time already.

Please comment what are your views on this matter, especially about A and C.
Thank you so much!