Which of the Following Reasons Encourages Companies to Make a Product

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

A) Making a product gives managers greater control over the production process.
B) Making a product lowers the risk associated with the production process.
C) Making a product increases the company's flexibility to respond to market conditions.
D) Making a product gives companies a great deal of power in their relationships with suppliers.