Assertion: In performing stage, the group progresses toward achieving its goals, and members actively contribute to the group's efforts.

Reasoning: In performing stage, once the specific objective is achieved/completed, the group disbands.

Assertion (A) is true but Reasoning (R) is not correct.

The correct answer is Option 3: Assertion (A) is true but Reasoning (R) is not correct.

Assertion: In performing stage, the group progresses toward achieving its goals, and members actively contribute to the group's efforts. This is correct. The fourth stage is known as performing. At this point, the group's structure has evolved and is accepted by its members. The group progresses toward achieving its goals, and members actively contribute to the group's efforts. For some groups, this stage marks the final phase of their development.

Reasoning: In performing stage, once the specific objective is achieved/completed, the group disbands. This is incorrect. The disbanding of the group occurs in the Adjourning stage, not during the Performing stage.

NCERT:

1. Performing: The fourth stage is known as performing. At this point, the group's structure has evolved and is accepted by its members. The group progresses toward achieving its goals, and members actively contribute to the group's efforts. For some groups, this stage marks the final phase of their development.
2. Adjourning (optional): However, certain groups, such as organizing committees or school functions, may undergo an additional stage called adjourning. In this stage, once the specific function or event is completed, the group disbands.