Final answer:
The attribute involved in this action by the nurse manager is establishing a sense of urgency.
Step-by-step explanation:
The attribute of Kotter's eight-step model involved in this action by the nurse manager is d) Establishing a sense of urgency. By initiating an open dialogue about the external and internal realities among the team members, the nurse manager is creating a sense of urgency around the issue of increased infection rates. This is important because a sense of urgency helps to motivate the team to take action and implement changes, such as revising the visitor policy, in order to reduce the infection rates.