【单选题】Public transit. In North America, public transportation has been the major casualty of the commitment to the automobile. Ridership on public transportation declined in the United States from 23 billio...
A.
Commuter railroad service, trolleys and buses have been reduced in the U. S.
B.
Subways have largely been maintained.
C.
Fares usually can not cover operating costs.
D.
U.S. officials think it worthwhile to subsidize public transportation.