A compound is a pure substance made of two or more different chemical:
a.) Material
b.) Element
c.) Composition
d.) Particle

Hint: A compound is formed due to its different types of bonds formed between the constituents of it.
- A compound differs due to the nature of bonds between the atoms of elements which actually form it. The structure and nature of bonds tends to form the most stable compound.
- A compound is a pure substance.

Complete step by step answer:
- A Compound is a pure substance which is formed from the molecules of constituent elements. It can be broken down into a simpler type of matter (elements) by chemical means and not by physical matter.a compound is made up of one or different types of elements thus giving it a different structural and chemical properties. Compounds are more easily found in nature rather than the elements which means elements are found in a combined state in the form of compounds.
- Compounds are formed when elements are joined and held together by strong forces called chemical bonds. These bonds can be ionic,covalent or coordinate bonds.
- Also for the formation of compounds there must be a chemical reaction between the constituent elements. when chemical bonds are formed an entirely new substance which is compound is formed.
So, the correct answer is “Option B”.

Additional Information:
Chemical composition is defined as the arrangement and ratio of atoms and molecules of chemical substances. The chemical composition of a substance also determines the properties of the substance.The chemical composition of a substance determines its ratio of elements, the size of the compound, intramolecular forces, color etc.

Note: We know that compounds are formed from different elements yet they are termed as pure substance because according to the definition of a pure substance, compounds have a fixed ratio of composition of elements in them.
Also compounds have fixed chemical properties throughout them as it is formed from many molecules of the same kind.