A group that has transformed itself from a collection of individuals into a productive, problem-solving, highly functioning team would be functioning in which stage of group development?

The correct answer is B: Performing. In the group development model by Tuckman, after forming, storming, and norming stages, a group reaches the performing stage where they are highly productive, cohesive, and focused on achieving goals. Members work collaboratively, communicate effectively, and demonstrate high levels of trust and synergy. This stage is characterized by smooth coordination, mutual support, and efficient problem-solving. The other choices are incorrect because: A: Forming is the initial stage where the group comes together and gets acquainted. C: Norming is when conflicts are resolved, and group norms are established. D: Storming is marked by conflicts and power struggles within the group. E, F, G are not applicable in the Tuckman model.