Which is the best description of a molecule?

A molecule of an element is composed of at least two types of atoms.

O Amolecule of a compound is composed of only one type of atom.

O Amolecule of a compound is composed of at least two types of atoms.

A molecule of an element is composed of exactly two types of atoms.

A molecule of a compound is composed of at least two types of atoms.

Explanation:

A molecule is defined as when two or more atoms of an element combine together by the bonds by sharing the electrons as O^2 (oxygen molecule)

A compound is a molecule when two different types of atom joined by chemical bonds as covalent, ionic or coordinate bonds as NH^3 (ammonia)