What is the most logical and crucial message conveyed by the passage?

• A. Urban local bodies must recover costs through user charges.
• B. Urban local bodies are not efficient enough to meet the water requirements of our cities.
• C. Water shortage in our cities is a perennial problem that cannot be solved.
• D. In view of the water crisis in our cities, there is an urgent need to limit the population of cities by adopting an upper limit of population size.