Answer:
d. All of the above are correct.
Explanation:
By driving on a congested road, on which no toll is charged means maximum people avoiding payment of toll will take this road.
The driver will contribute to overuse of common resource as this is the common road with least cost, traffic will be highest on this road.
It will contribute negatively as will lead to external problem, as space on road will decrease.
As he occupies space on common road, he will be also contribute to increase in traffic and thus would increase and add to time cost for other drivers also.
Thus, all of the above statements are true.