A Region Is Considering Two Sites on Which to Locate

A region is considering two sites on which to locate a new wastewater treatment plant. Site A has been owned by the region for five years and the region initially paid $200,000 for the land.The current market value of the site is $400,000.Site B is land the region would have to purchase for $300,000.What is the social opportunity cost of each site?

A) $200,000 for Site A; $300,000 for Site B
B) $300,000 for Site A; $300,000 for Site B
C) $400,000 for Site A; $300,000 for Site B
D) The social opportunity cost should be state for the project, not each site and would be equal to the lowest value for either site, $200,000