Answer: C. Involve the team in creating ground rules for the meetings.
Explanation:
The meetings have seemingly descended into anarchy and as such needs to be controlled in an orderly manner to make any sort of progress. One way this can be done is through the setting of ground rules. These rules need to be accepted and inclusive of people's qualms or else the arguments will continue.
When the rules are made therefore, the inputs of the entire team should be taken into consideration and this is what the Project manager needs to do. Setting all inclusive rules also helps the team understand each other better during the discussions are point of views will be seen and understood better.