Final answer:
The example illustrates the importance of involving all staff in discussions in group settings and addressing conflicts through open discussion and clear expectations.
Step-by-step explanation:
The example provided of Sally and Melissa's ongoing conflict without a clear reason represents the importance of involving all staff in discussions in group settings (c). When conflicts arise in a team, it is essential to encourage open discussion of disagreements in opinions (b) and ensure that expectations and objectives are made clear (a). By involving all staff members, conflicts can be addressed and resolved more effectively, fostering a more harmonious and productive work environment.