Correct Answer: Option A

Explanation

Water exhibits a unique property known as anomalous expansion between 0°C and 4°C.

When water is heated from 0°C, its density increases and reaches a maximum at approximately 4°C (precisely 3.98°C). This means the volume actually decreases slightly in this temperature range.

Beyond 4°C, the density begins to decrease as normal thermal expansion occurs, and the volume increases with further rise in temperature.

This unusual behaviour is why water is densest at 4°C.

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