Answer:
I believe the best answer to be letter D. The event could find a bottled water company to sponsor the event.
Explanation:
Let's briefly analyze each option according to the type of event.
Letter A says there should be no water at all. - Every event should have water available for the participants, and in this case even more so because the participants are racing. They will need water to rehydrate.
Letter B claims water fountains should be installed along the race. - This presents multiple problems. Volunteers and money would be needed to proceed with the installation, which means more costs and more work to be done. Plus, it is not practical for the racers. As we know, racers do not stop to drink water during the race. They reach for bottles on the side of the route and drink from them while running.
Letter C states the event should contact a T-shirt company for more donations. - That could be done but, if a company agrees to donate instead of sponsor, we have a different purpose for the money. Donations to buy books are the purpose of the race. Using the money to buy water makes no practical sense.
Letter D is the best option. If a bottled water company agrees to sponsor the event, that means they will provide the event with the much-needed water. There will be no need for more volunteers to install water fountains, nor more money to spend on buying water. The problem is solved in a more direct - and much simpler - way.