c. Sitting in the cockpit of a commercial airplane.
Explanation:
The National Geographic magazine article "Barrington Irving, Pilot and Educator" narrates how Barrington Irving became a pilot. Irving would become the first and youngest African American to be a pilot and fly solo around the world.
Irving had never thought of becoming a pilot at first. As he admitted, <em>"I didn’t think I was smart enough"</em>, Irving never thought about his future in the aviation scene. He was just helping out his parents at their bookstore. It was there that a chance encounter, a chance question by <em>"a Jamaican-born professional pilot"</em> and the chance to sit at the cockpit of a commercial airplane that <em>"hooked"</em> Irving to flying.
The paragraph specifically talks about how the body responds to stress.It does not give information on the caveman,neither does it give information on how modern and ancient stresses differ.
