Correct option is C
Thermal expansion refers to how much a substance’s volume changes in response to temperature fluctuations.
Liquids generally have higher coefficients of volume expansion than solids, and among common liquids, alcohol (especially ethanol) has a notably higher coefficient than water. When the temperature of a substance increases, the average kinetic energy of its molecules rises, pushing them farther apart.
Alcohol is often used in thermometers precisely because it expands and contracts significantly with temperature changes, offering sensitivity in measuring slight temperature variations. Compared to most metals (like brass) or glasses, a liquid such as alcohol shows a more pronounced volumetric expansion for the same temperature rise.
