The correct answer is A. ignore the pleas of his son.
Creon's tragic flaw is that he is too proud - he doesn't relent and listen to other people's advice thinking that his rule is for the best. However, his tragic flaw leads to all tragedies in the play - to Antigone killing herself, to Creon's son and wife killing themselves, and to him losing everyone and everything he loved. His son wanted him to release Antigone and give her brother a proper burial, but Creon refused to do that.