In a Working Group, While One Member, Nicole, Shared Another

In a working group, while one member, Nicole, shared another, Beth, made a rude comment under her breath. Nicole overheard Beth and told her it really upset her. Beth responded by telling Nicole she was being too sensitive. In a slightly raised voice, Nicole continued explaining why she was upset. Beth told Nicole to stop shouting and to calm down, which resulted in Nicole becoming even more frustrated. How should the group leader respond?

A) Allow Nicole to continuing explaining her frustration, while blocking Beth to work.
B) Facilitate their interaction so neither of them shut down and to assess the impact of the conflict on the other group members.
C) Block Nicole from continuing in order to allow Beth to work on her issues.
D) Block both Nicole and Beth from continuing and ignore the issue by bringing up something different.