The Table Below Shows the Payoff (Profit) Matrix of Firm

The table below shows the payoff (profit) matrix of Firm A and Firm B indicating the profit outcome that corresponds to each firm's pricing strategy (where $500 and $200 are the pricing strategies of two firms) .Table 12.2

-When all the costs and benefits of a transaction are borne by the participants of that transaction, _____.

A) the market outcome will be inefficient
B) the private costs and social costs are identical
C) negative externalities exist
D) positive externalities exist
E) the free rider problem arises