Consider the following data on the social costs and benefits associated with a policy to reduce water pollution (% reduction) by regulatory means: % reduction Social Costs (in millions) Social Benefits (in millions) 0 (status quo) 0 0 10 10 80 20 22 150 30 40 200 40 70 240 50 105 280 60 150 320 70 210 350 80 280 375 90 350 385 100 420 390 A. What level reduction (%) is most optimal based on the welfare (allocative efficiency) criterion? B. Current budgetary constraints limit the amount availab