A court is listening intently to counsel's argument regarding duty of care in a case arising in negligence. What must counsel have already firmly established to now be addressing the issue of duty of care for the court's deliberation?

A. That the plaintiff had a duty to avoid carelessness that caused harm to another

B. The specific standard that helps a court assess the plaintiff's significance

C. The identity of the person selling the goods or services

Choose the right letter please.