Correct Answer: B

Rationale: H₂O is the chemical formula for water, consisting of two hydrogen atoms bonded to one oxygen atom. Water is an essential compound for all known forms of life and exists naturally in three states — solid (ice), liquid (water), and gas (vapor). It covers about 71% of the Earth’s surface, mainly in oceans, rivers, and lakes. Water regulates temperature, supports metabolic processes, and is crucial in agriculture, industry, and domestic use. Its unique molecular structure gives it properties like high surface tension and solvent ability, making it vital to biological and environmental systems.

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