This is incomplete because the question is missing, here is the missing question and options:
Which phase of team development does this situation describe?
A. Performing
B. Norming
C. Forming
D. Storming
The answer to this question is B. Norming
Step-by-step explanation:
In team development, norming is the third stage in the process of creating a team and making its members work together. This stage occurs after members have known each other (forming) and had solved their problems (storming). Due to this, during this stage members are able to work together and there are clear roles, which facilitates communication and adaptation. This stage is the one described because roles have been defined "everyone is taking on leadership functions related to their roles" and it seems the integration after three months facilitates communication and changes "report back to the rest of the team and smoothly adjust the project plan."