Select the option that can be used as a one-word substitute for the given group of words.

A thing or substance that is liable to catch fire easily

Inflammable

The one-word substitute for a thing or substance that is liable to catch fire easily is inflammable.

• Inaudible means not loud enough to be heard.
• Inflammable means that burns easily.
• Incombustible means consisting or made of material that does not burn if exposed to fire.
• Extinguishable means capable of being extinguished or killed.

Inflammable is the most appropriate word for this group of words because it specifically refers to a thing or substance that is easily combustible. The other words do not have the same connotation of fire hazard.