XYZ Co. used to rent out a small annex attached to the rear of the building for $30,000 per year. The renter's lease will expire soon, and rather than renewing the lease, the company has decided to use the annex to manufacture a new product, with estimated costs of $40,000 and estimated profits of $90,000. What is the opportunity cost of using the annex to manufacture the new product? O A. $40,000 OB. $50,000 o C. $30,000 OD. $20,000