In operant terms, A. yelling is serving to reinforce the misbehavior instead of punishing them.
Step-by-step explanation:
The operant way of defining punishments and reinforcements depend on the way they are worked upon in real life and the results they generate for parents and children a part of it.
The yelling that Kim does here frustrates the child and emboldens him to aggravate more.
Thus its primary function as a negative reinforcement or even negative punishment does not work as it is not discouraging the child to not behave he way they do.
Instead this is working to aggravate the problem itself.