Final answer:
The group is in the Storming stage of group development, characterized by tension, conflict, and competition among members as they establish their roles within the group.
Step-by-step explanation:
Based on the description of the school counselor observing tension and certain behaviors among group members within the facilitated group, the group appears to be in the Storming stage of group development. This stage is characterized by conflict and competition among group members as they assert their opinions and struggle to establish a hierarchy and norms. Disagreements, dominance by certain individuals, and visible frustration are common indicators of this stage. It is a critical phase for the counselor to manage constructively as the group navigates through these challenges toward more effective teamwork and collaboration in subsequent stages.