The correct answer is A) cooling, removing to shaded area, and lying down. The principle treatment for sunstroke (also known as heat stroke) is to rapidly cool the body and move the person to a shaded, cool area. This helps lower the dangerously high body temperature that characterizes sunstroke. Options B and C (bathing with rubbing alcohol and drinking ice water) are not the recommended first-line treatments, as they may be less effective or even potentially harmful. Cooling the body and resting in a shaded area are the most important initial steps in managing a case of sunstroke.