C) To produce goods or services previously purchasedThe statement to produce goods or services previously purchased best describes vertical integration. Vertical integration can help provide a strategic advantage for firms that have the capital and talent to handle the additional scope of responsibility. Specifically, vertical integration can help reduce costs, increase quality, and ensure timely delivery.Building long-term partnerships with a few suppliers is a supply-chain strategy called few suppliers. Creating complementary products is a business model and manufacturing strategy focused on differentiation; it is not, however, considered a common supply-chain strategy.