A remote site on public land rarely visited by people provides important habitat for several wildlife species. Government must decide whether to issue a lease for mining at the site. The benefits accruing from a potential mining lease have been estimated. Which of the following approaches would be the most appropriate for estimating the wildlife habitat benefits that may be lost if the site is developed?

a.Hedonic estimation
b.Travel cost
c. Contingent valuation
d. Revealed preference