The correct answer is letter A.
Explanation: Tuckman's five-stage group development model assumes that groups generally have standardized behaviors that go through five stages: forming, storming, norming, performing, and disruption.
Forming is the initial stage, in which members are beginning to interact. It is characterized by a great deal of uncertainty about the group's purposes, structure and leadership. Members are “recognizing the ground” to find out what behaviors are acceptable. It is at this time that members begin to think of themselves as parts of the group.