According to the Project Management Professional (PMP) Reference Materials, the norming stage of team development is when the team members start to respect each other, collaborate effectively, and work towards a common vision1. One of the ways to facilitate this stage is to plan social activities that can help the team members bond, build trust, and appreciate their diversity2. By engaging in social activities, the team can also identify shared goals and values that can motivate them to perform better on the project3. The other options, B, C, and D, are not effective ways to move the team to the norming stage. Speaking with the project sponsor about changing the team composition may disrupt the team dynamics and cause more conflicts4. Figuring out who is behind the issues and applying progressive disciplinary techniques may create resentment and fear among the team members and damage their morale5. Showing the team the schedule impact of their communication issues and encouraging them to put their differences aside may not address the root causes of the problems and may lead to further misunderstandings and frustrations. References: 1: A Guide to the Project Management Body of Knowledge (PMBOK® Guide) – Sixth Edition, Chapter 9.4.2.2, "Team Development Stages". 2: The Five Stages of Team Development and the Role of the Project Manager, Section "Norming". 3: Manager’s Guide to Navigating The Four Stages of Team Development, Section "Norming Stage". 4: Climbing to Performance : Four Stages of Team Development, Section "Storming". 5: Project Human Resource Management, Section "Managing Project Teams". : How To Move The Team Through The Stages Of Team Development, Section "Storming".