Answer: B. Government intervention.
Step-by-step explanation:
A Drive-through bar could be very profitable as it involves people simply pulling up to a window, ordering alcohol and driving away with it. It is not very workable though because it is dangerous.
Drinking and driving is one of the highest causes of road accidents and a drive-through bar is literally encouraging people to do that. The government has therefore intervened by enacting laws to limit the trading of liquor in such ways so as to reduce the instance of road accident.