Three ducks, Huey, Dewey, and Louie, are squawking about how big of a pond they should purchase together. Huey's individual demand curve is given by: Huey: P = 171 - 4Q The price per square metre of pond is $47. If the ducks can't cooperate, Dewey and Louie will free-ride on Huey's provision of the pond, although this will yield a pond 5 square metres smaller than the socially optimal pond. If instead the ducks could work together and each pay their Lindahl price, what would Dewey pay if Dewey and Louie have the same demand curve? O a. $0 O b. $10.00 O c. $13.50 O d. $20.00