The table below shows the supply and demand for the output of$$a firm which creates pollution.$$The third column shows the supply schedule for the firm without paying the costs of pollution. The last column represents the supply curve when the firm also pays$$the social costs of pollution. What is the equilibrium quantity produced when the firm is paying only the private costs of production?

$$

Supply and Demand for a Firm Which Generates Pollution

PriceQuantity DemandedQuantity Supplied $($without paying

the costs of the externality$)$Quantity Supplied $($after paying

the costs of the externality$)$$$240104$$$20193\mathrm{.}5$$$1937\mathrm{.}53$$$16442$$$14531\mathrm{.}5$$$117\mathrm{.}521$

Select the correct answer below:

$3$

$4$

$7\mathrm{.}5$

$9$