The USGovernment Bought 112,000 Acres of Land in Southeastern Colorado in in 1968

The U.S.Government bought 112,000 acres of land in southeastern Colorado in 1968 for $17,500,000.The cost of using this land today exclusively for the reintroduction of the black-tailed prairie dog

A) is zero,because they already own the land.
B) is zero,because the land represents a sunk cost.
C) is equal to the market value of the land.
D) is equal to the total dollar value the land would yield if used for farming and ranching.
E) depends on the value to society of black-tailed prairie dogs.