The correct answer is (b) Water. Water is classified as a renewable resource because it is constantly replenished through the Earth’s natural water cycle, involving processes like evaporation, condensation, and precipitation. While the supply of freshwater can be affected by overuse or pollution, it is generally considered sustainable over time. In contrast, coal, natural gas, and petrol are non-renewable resources, as they take millions of years to form and are consumed faster than they can be replenished.

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