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Question 14 (1 point) The table provides the marginal private benefit, marginal social benefit, and marginal private cost. The efficient (socially optimal) level of output is: Marginal Marginal Marginal private cost private benefit social benefit Quantity (dollars) (dollars) (dollars) 500 550 600 650 a) 550 Ob) 600 O c) 650 O d) 700