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What is the central idea of this article?
A. The drawbacks of congestion pricing make it
difficult to determine whether it's worthwhile for U.S.
cities to pursue.
B. If done correctly, congestion pricing shows
promise as a way to improve conditions in U.S.
cities.
C. Congestion pricing has worked well in other
countries, but it is unlikely to work well in U.S. cities.
D. Scholars disagree over how successful
congestion pricing would be in U.S. cities.