Answer:
d. adjourning
Step-by-step explanation:
A group's disbanding is called the adjourning phase. The adjournment stage, created by Bruce Tuckman in 1977, is the fifth and final phase of group creation that takes place whenever a team concludes its work and then dissolves.
At around this point, it is crucial that team members get sufficient resolution and appreciation for the work they've done.
Remember that not all groups are going through a period of adjournment. If the team remains together for future projects, the adjournment stage of group growth would not go through.