Final answer:
During the defensive stage, it is important to speak calmly, be aware of your emotions, and intervene early and set limits. However, it is not appropriate to remain close to the patient.
Step-by-step explanation:
In the defensive stage, all of the provided options can be appropriate interventions except for option C, which states 'Remain 1-2 feet from the patient.' It is important to maintain a safe distance from the patient during potentially violent situations to ensure the safety of both parties. The other options - speaking in a calm voice, being aware of your own emotional responses, and intervening early and setting appropriate limits - all contribute to effectively managing conflicts and preventing escalation.