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

Correct option is B

The correct one-word substitute for the given group of words is (b) Inflammable.
Explanation:
An inflammable substance is one that can easily catch fire and burn rapidly. (आग पकड़ने योग्य, ज्वलनशील)
Example:
· Petrol is highly inflammable, so it must be stored carefully.
Meanings of other options:
· (a) Inaudible – Something that cannot be heard. (जो सुना न जा सके)
· (c) Incombustible – Something that cannot catch fire. (अज्वलनशील)
· (d) Extinguishable – Something that can be put out or stopped from burning. (बुझाने योग्य)