In effective groups, members:

A) have unique goals, interests, and benefits.
B) do not have a leader.
C) share the same status.
D) establish norms for standard behavior.

Effective groups establish norms for standard behavior to promote consistency, trustworthiness, and a sense of cohesion among members. A lack of norms can lead to confusion and misunderstandings within the group. Having unique goals, interests, and benefits (A) can actually create competition and conflict within the group, and having no leader (B) can result in a lack of direction and organization. While it is possible for members to have different roles or levels of authority, effective groups typically share the same status (C) in terms of their commitment to the group's goals and their willingness to work collaboratively.