What are the building blocks of matter?

Because an element cannot be formed or destroyed by regular chemical processes, it is frequently referred to as a pure material.
However, in the natural world, elements seldom exist by themselves; instead, they interact with other elements to create compounds through chemical bonds.
These elements are used by our body to create a variety of chemical compounds that are necessary, but our body cannot produce these elements on its own. These originate from outside sources, such as food, air, and water.

For instance, the digestive process breaks down the food we eat into smaller parts, occasionally even atoms. It is impossible to divide an element further. The human body contains many common elements, including carbon (C), oxygen (O), hydrogen (H), and nitrogen (N) (N).
An atom is a minuscule particle that has all the distinct characteristics of an element. Since atoms are the smallest unit of an element, they are also known as the building blocks of matter.
It has recently been discovered that even atoms are composed of smaller particles known as subatomic particles. Protons, neutrons, and electrons make up the majority of these particles.

The atom's nucleus contains positively charged protons, which are subatomic particles. The nucleus contains neutrons as well, although these are neutral particles. These two subatomic particles give an atom its mass.
The subatomic particles that spin around the nucleus are called electrons, and they are negatively charged. They cannot affect an atom's mass, but they can affect an atom's total charge or ionisation characteristics.

Hence option (C) is correct.