For a 3-hour marathon in warm conditions, which beverage choice is most appropriate for maintaining hydration and performance for most runners?

• A. A sports drink with carbohydrates and electrolytes because long-duration exercise benefits from both fluid replacement and modest carbohydrate/electrolyte replenishment
• B. Plain diet soda because artificial sweeteners provide the necessary electrolytes without calories and are preferable to carbohydrate solutions for endurance
• C. Full‑fat milk exclusively because its protein and fat content optimally replace lost fluids and prevent muscle cramping during long races
• D. Specialty alkalized bottled water with added minerals, since pH adjustment is the most important determinant of exercise performance and hydration during long races

Answer: (A)