In General, How Should a Counselor Respond to a Client

In general, how should a counselor respond to a client who is cheating at a board game?

A) Ignore the cheating so as to show the client he/she is accepted no matter what
B) Begin cheating as well to help the client understand how it feels to be cheated
C) Calmly and kindly repeat the rules to the game
D) Empathically acknowledge the child's cheating behavior and/or the intention behind it