Answer:
Element
Step-by-step explanation:
Elements are primary constituents of matter and consists of only one kind of atom. Elements are distinguished by atomic number. Elements cannot be broken down by any chemical reactions.
Compounds are substance made of two or more types of atoms. Compounds can be broken into its constituents elements
Matter can be of any type. Matter can be elements, compounds, mixture, etc.
Among given option, option b is correct.