Which of the following is an example of a formal group?

A formal group is characterized by its structured organization and specific goals, often established by an authority or institution. In this particular case, the committee planning a school event is an example of a formal group because it is likely formed for a defined purpose, involves designated roles and responsibilities, and follows a set agenda or plan. Such groups typically operate within an official framework and are often documented in some capacity, which distinguishes them from informal groups.

Conversely, the other options—like a group of friends gathering for dinner, team members brainstorming for a project, and a family meeting—represent more casual or informal group settings. These groups typically lack the explicit structure, specific objectives, and formal recognition associated with formal groups, which is why they do not fit the definition of a formal group in the same way that a committee does.