Answer:
a. norming
Step-by-step explanation:
Referring to the given information, The Tuckman's stage of development theory explains the importance of communication among employees in the norming stage.
Norming stage focuses on building the effective communication between the employees so that they do not hesitate in interacting, and start sharing their views with other employees.
This is basically needed, in order to ensure the best results in the stage of performing. As that would be possible only when the employees who would perform together do interact properly and engage to express openly about the difficulties, and ask for help.