Which of the Following Reasons Encourages Companies to Buy a Product

Which of the following reasons encourages companies to buy a product rather than make it?

A) Buying a product gives managers greater control over the production process.
B) Buying a product decreases the company's total costs significantly compared to making the product in-house.
C) Buying a product ensures non-flexibility to local market conditions.
D) Buying a product enables a company to gain a great deal of power in their relationships with suppliers.