Answer:
The correct answer is letter "B": the suppliers of raw materials to the firm are unable to maintain quality standards.
Step-by-step explanation:
Vertical integration takes place when a corporation buys and manages other firms along its supply chain. Vertical integration has two types: backward and forward. In backward vertical integration, a company such as a manufacturer owns companies that supply inputs (for example, raw materials) to ensure quality standards in the manufacturing process of the business. In forward vertical integration, a company owns another company in the supply chain to get closer to the end-customer.