For the following question, recall the model of retail disposal charges presented in chapter 18 of Callan and Thomas. Follow the same conventions of that model where you consider the harmful effects of battery disposal to be part of the demand side of the market (i.e. the benefit side) rather than the supply side (the cost side). Let MSC denote the marginal social cost of production, let MPC denote the marginal private cost of production, let MPB denote the marginal private benefit of consumption, let MSB denote the marginal social benefit of consumption, let MEB denote the marginal external benefit of consumption, let QC denote the private (i.e. competitive) market equilibrium quantity of batteries, and let QE denote the socially efficient quantity of batteries. Suppose that Sweden imposes a retail disposal charge on household batteries. To assure that allocati efficiency is achieved, this charge should be set equal to: the vertical distance between MSB and MPB at QC the marginal social benefit at QE the MPC associated with battery production O the MEB at the efficient equilibrium O none of the above