To Efficiently Manage Traffic on a System of Bridges

Multiple Choice

To efficiently manage traffic on a system of bridges,

A) the more-crowded bridges should have lower tolls, so that they are affordable.
B) the tolls should be equal for all bridges, so that people can choose the most convenient routes.
C) tolls should be higher on more-crowded bridges and lower on less-crowded bridges.
D) there should be no tolls on bridges, because people should not have to pay to drive to their jobs.