Which action exemplifies primary prevention in disaster management?

Primary prevention in disaster management focuses on taking proactive measures to prevent disasters from occurring or to mitigate their impacts before they happen. Training potential rescue workers in basic first aid is a prime example of this proactive approach. By equipping individuals with the skills needed to respond to emergencies, the likelihood of severe outcomes during a disaster can be significantly reduced. This foundation helps ensure that when an event occurs, there are knowledgeable individuals ready to assist immediately, thereby potentially lessening injuries and saving lives.

This contrasts with the other options, which focus on actions taken after a disaster has occurred, rather than preventing it or reducing its impact beforehand. Performing triage, supervising shelter activities, and providing follow-up care are all critical aspects of disaster response and recovery but do not fall under the category of primary prevention as they address the aftermath of a disaster rather than preventive measures taken in advance.