The Atlantic City Expressway Is a Highway That Runs from Outside

Multiple Choice

The Atlantic City Expressway is a highway that runs from outside Philadelphia to Atlantic City, New Jersey. It is notoriously congested during the summer weekends when many people are driving to the beach about the same time. The marginal private cost for a driver of driving on the Expressway includes I. the cost of gasoline.
II) the cost of increasing congestion for everyone else.

A) I only
B) II only
C) Both I and II
D) Neither I nor II