The following data are for a series of increasingly extensive flood-control projects. Total Cost Per Year Total Benefit Per Year Plan A = Levees $ 10,000 $ 16,000 Plan B = Small Reservoir 24,000 36,006 Plan C = Medium Reservoir 44,000 52,000 Plan D = Large Reservoir 72,000 64,000 For Plan A marginal costs and marginal benefits are Multiple Choice O $10,000 and $16,000, respectively. O $16,000 and $26,000, respectively. O $20,000 and $16,000, respectively. O $20,000 and $32,000, respectively