In what stage of group development do members focus on the purpose the group is trying to accomplish?

A. The initial phase is when members get to know each other, establish trust, and set group rules. B. The final stage involves termination, closure, and reflection on accomplishments. C. "Competition phase" is not a recognized stage in group development. D. The working phase is when members focus on the group’s purpose, actively engage in problem-solving, and work toward accomplishing goals.