The study of urban water demand in geography clarifies which relation?

Correct answer: Relation among population growth water sources distribution and policy

The direct answer is option B: the relation among population growth, water sources, distribution and policy. Urban water demand is not explained by one object alone. As population and household use increase, cities need more water. Geography then examines where the water comes from, such as rivers, reservoirs or groundwater, how it is transported and distributed, and how government policy manages scarcity, access and conservation. Option A, pipe colour, does not explain demand or supply. Option B is correct because it connects human population, natural resources, infrastructure and public decisions. Option C, only the river's name, gives no analysis of quantity, access or management. Option D, only tank size, describes one facility and cannot explain the whole urban system. Exam cue: urban water is a human-environment relationship involving demand, resource, network and policy.