According to the passage, what could be an efficient way to use water？A．Adopting the syste

According to the passage, what could be an efficient way to use water？

A．Adopting the system of water right owned by the government.

B．Charging for water in places where water is becoming scarcer.

C．Taking political measures to interfere with the water issue.

D．Making it a free market for people to trade water-usage rights.

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