When Monique drives to work every morning, she drives on a congested highway. What Monique does not realize is that when she enters the highway each morning she increases the travel time of all other drivers on the highway. In this case, the external cost of Monique's highway trip .a. increases the social cost above the private cost.
b. lowers the social cost below the private cost.
c. increases the social value above the private benefit.
d. decreases the social value below the private benefit.