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

-Which of the following is an example of a positive externality?

A) Smoking a cigarette
B) Driving a less fuel efficient vehicle
C) Setting up a chemicals factory in a residential area
D) Overuse of chemical fertilizers
E) Beekeepers keeping bees for honey