Verified Answer :

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I think the correct answer from the choices listed above is option A. Atoms is referred to as the basic unit of matter. It is present in all phases and in every object. It consists of electrons, protons and neutrons in which these particles cannot present alone as it is.

Answer: The correct answer is A) Atoms.

Atom is considered as the smallest unit of matter. This is because atom can not be further divided into any smaller form using chemical means.

This was first explained by Dalton's atomic theory. According to this theory, matter is composed of atoms, which can not be divided further and so they are indestructible.

Thus, A) Atoms is the right answer.