You own a building that has four possible uses: a tailor shop, a pharmacy, a sports bar, and an antique mall. The building's value in each use is $$4,000$;$$6,000$;$$8,000$; and $$10,000,$ respectively. You decide to open a sports bar. The opportunity cost of using this building for a sports bar is

A$)$ $$10,000,$ the value if you rented the building to someone else to use as an antique mall.

B$)$ $$6,000,$ the value if the building is used as a pharmacy.

C$)$ $$20,000,$ the sum of the values if the building is used for a tailor shop, a pharmacy, or an antique mall.

D$)$ $$4,000,$ the value if the building is used as a tailor shop.