Answer: A plant is a subsection of a firm and a firm is subsection of an industry, an industry is a collection of similar or diverse kind of firms
Explanation:
Plant - is an institution that performs more than one function relating to the production of goods and services
Firm - is an organization that uses diverse resources for the production of goods and services to earn a profit. They operate more than one plant
Industry - is a collection of firms that in into similar or diverse kind of goods and services.
