Final answer:
The uninjured person lost in the woods should first stay calm and assess the situation to plan their next steps effectively, which could include building a shelter, finding food and water, or signaling for help.
Step-by-step explanation:
If an uninjured person is lost in the woods, their first concern should be to stay calm and assess the situation (Option D). This is crucial because a clear and calm mind is needed to plan the next steps effectively, ensuring safety and survival. Prioritizing actions such as building a shelter, finding food and water, and signaling for help are essential, but they come after assessing the situation and creating a plan. It's similar to how emergency responders like firefighters must assess fires and situations before acting. In the case of being trapped by a blizzard in an unheated, uninsulated cabin, the body's regulatory processes would focus on maintaining core temperature to prevent hypothermia.
For a person lost in the woods, preparing the body to fight or flee, depending on what the assessment dictates, is critical. Additionally, if witnessing someone in need of help, such as a drowning person, priorities include ensuring safety first by getting them out of the water before administering CPR. This response is mandated by the requirement to control internal body systems and keep them in balance amidst an emergency.