What should you do if a volunteer expresses feeling dizzy while you are providing first aid to another child?

Encouraging the volunteer to lie down and perform Progressive Muscle Relaxation (PMR) techniques is the most appropriate response when someone expresses feelings of dizziness. This approach acknowledges their discomfort and helps manage their symptoms effectively. Lying down can assist in improving blood flow and reduce the chance of fainting, while PMR can alleviate anxiety and promote relaxation.

Addressing dizziness in this proactive manner ensures the volunteer's well-being while maintaining focus on the other child requiring first aid. The option to tell them to sit down might not be sufficient as it does not effectively mitigate the feeling of dizziness. Ignoring the comment could lead to a worsening of the volunteer's condition, putting them at risk. Asking a nearby adult to take care of them might shift the responsibility away from providing immediate support, which is crucial in such a situation. 所以，选择更合适的是鼓励志愿者放松和躺下，以帮助管理他们的症状。