At the Current Level of Output, the Marginal Social Cost

Multiple Choice

At the current level of output, the marginal social cost of paper is $30 per ton and its marginal private cost is $20 per ton. The marginal social benefit from paper is $30 per ton. This means that the current level of production is

A) greater than the efficient level.
B) efficient.
C) less than the efficient level.
D) the equilibrium quantity attained in an unregulated perfectly competitive market.