During a Group Session One Member Accuses Another of Making

During a group session one member accuses another of making fun of him to a nonmember.The other member denies the claim,adding,"I wasn't talking about you at all." Which response by the nurse would have the greatest therapeutic value to the issue of group confidentiality?

A) "I'm very disappointed to hear that confidentiality is not taken seriously by members of this group."
B) "It sounds as though neither of you are acting in a manner that is mutually respectful. What do the rest of you think?"
C) "It appears that we need to revisit the guidelines for group meetings. Do we all agree that what is discussed in this group needs to stay in the group?"
D) "While there may be times when we are tempted to talk with others about things discussed in group, it is not allowed because it could result in hurt feelings."