An element is made up of:
A. One kind of atom
B. Two kind of atoms
C. More than two types of atoms
D. None of these

Hint: There are many differences between molecules and elements. We have to remember that an element is the smallest piece of chemical material, which is the smallest piece of chemical material, which is the basic unit of mass and considering every element. Every substance on earth has a chemical composition that is a compound that has mass and occupies space and is made up of atoms.

Complete step by step answer:
We have to remember that an atom is a particle of matter which characterizes a chemical element and the smallest part of ordinary matter.
The element is formed from one sort of atom which consists of protons, electrons and neutrons are the subatomic particles. For example, Carbon (C), Silicon (Si), etc.

So, the correct answer is Option A.

Additional information:
Now we can compare of molecule with elements as,
Definition: In molecules, atoms which bond together with other atoms to sort a molecule.
In elements, the most fundamental substance with a single type of atom.
Chemical reaction: In molecules, it is required. In elements it’s not required.
Size: In molecules, it’s large. In elements it’s small
Compounds: In molecules, all compounds are molecules. In elements, not all are compounds.

Note: We must remember that the chemical composition has mass and occupies some from space. Molecules are further divided into homo-atomic and hetero-atomic molecules. All compounds are molecules but all molecules are compounds. Molecules exist with all properties of the elements or compounds.