Final answer:
The best approach is to acknowledge the upset nurse's expertise and explain expectations for teamwork and communication.
Step-by-step explanation:
The best approach that can be used by the new nurse manager to gain the trust and respect of the nursing staff on the unit is option d. Acknowledge the clinical expertise of the upset nurse and clearly explain the expectations for teamwork and open, honest communication. This approach shows respect for the upset nurse's knowledge and experience while also setting clear expectations for collaboration and communication within the team.