The Idea of Requiring Motorists to Pay to Use the Busiest

The idea of requiring motorists to pay to use the busiest streets in a city

A) has been proposed by many public officials, but to date the idea never has been tried in a major city anywhere in the world.
B) was tried in New York City in the 1990s, but the result was more - not less - congestion on busy streets, and the experiment was short-lived.
C) reflects the fact that a congested road is a public good.
D) reflects the fact that a congested road is a common resource.