Refer to the Graph Shown

Refer to the graph shown. Say that there is a negative externality associated with the production of the good depicted. The marginal social cost from consuming this good at the competitive equilibrium output level is:

A) either greater than or less than P₀, depending on the elasticities of supply and demand.
B) greater than P₀.
C) less than P₀.
D) equal to P₀.