B. useful products are made is the correct answer.
Explanation:
The industry is a group of organizations that provide goods and services.In industry useful products are made.
The manufacturing of goods and the useful product usually occur in the industry as making of products require machinery and skilled labor and production occur on large scale, so the manufacturing of the useful product is done in Industry.
production of products requires materials,engineering layout, inspection, test,and this entire process is performed in the industry.
