Base on the information in paragraph 2, what can b...

Câu hỏi: Base on the information in paragraph 2, what can be inferred about most population centers?

A They have grown to sizes unsustainable by current water resources.

B They generally can be found in close proximity to a source of surface water.

C They always contribute to greater levels of pollution in surface water.

D They are unable to cope with rising levels of bacteria in surface water.