Given that people usually exploit opportunities to make themselves better off, which of the following policies is MOS likely to reduce road congestion in Los Angeles $($the worst traffic city in America$)?$ a limited number of free parking passes for the first $100$ who arrive prior to $6$ A$.$M$.$ an increase in the price of bus fare to and from the city a toll road that requires each car to pay a congestion fee to enter the city center allowing electric cars to ride in the reserved bus lanes