In which of the following classical Indian schools of philosophy was atomism propounded?

Atomism was propounded in the Vaisheshika school of classical Indian philosophy.

Advaita is a monistic Vedanta system, not concerned with atomic theory.

Buddhism developed its own metaphysics but is not the school credited here.

Sankhya explains reality through purusha and prakriti, not atoms.

The sage Kanada is regarded as the founder of Vaisheshika atomism.

It holds that material objects are formed from indivisible atoms called paramanu.