Which of the following is a step to take when checking a conscious person?

The correct choice emphasizes the importance of communication and assessment when dealing with a conscious individual in a potential emergency. By calling 911 and asking pertinent questions, you ensure that trained medical professionals are alerted to the situation and can provide guidance on how to proceed. This is a key step in the emergency response process, as it helps establish whether the situation requires immediate medical assistance and can provide the dispatcher with valuable information about the individual’s condition.

Assessing a conscious person’s condition while simultaneously engaging emergency services allows for a more effective response. It enables you to relay critical details about the person's symptoms, history, or any potential hazards that may be present. By doing so, you facilitate a quicker and more appropriate medical response, which can be vital in emergencies.

In contrast, requesting medical history, asking if they can stand, or providing first aid treatment directly may not prioritize the immediate need for professional help and could compromise the safety or stability of the individual until trained responders arrive. Each of those actions, while potentially relevant in certain contexts, does not effectively align with the critical first step of securing emergency assistance.