Final answer:
Varsol is best classified as a 'flammable liquid' due to its properties and lower flash point allowing it to ignite easily at room temperature.
Step-by-step explanation:
Varsol, commonly known as paint thinner, is a type of organic solvent that is used to thin paints and clean surfaces. When considering the options provided, it is important to distinguish between 'combustible', 'flammable', and 'corrosive'. Combustible substances catch fire and burn easily at higher temperatures, while flammable liquids have a lower flash point and can ignite more easily at room temperature. Corrosive materials, on the other hand, degrade other materials through chemical reactions. Given that most organic solvents, including Varsol, are known to be flammable due to their volatility, the best classification for Varsol is C) flammable liquid.