The ocean is least likely because it is salt water not fresh water, as opposed to lakes :)
Answer: C.Food
Explanation: In the process of photosynthesis, the chloroplasts in the cell make the food- sugar/glucose-. they do this by collecting the sunlight, water, and carbon dioxide, making the food. Any food they don't end up using is then converted to oxygen.
The runner is most likely dehydrated, not enough sleep, or heat stroke
