AttEmpts to rEstriCt pArking in thE City CEntEr hAvE FurthEr _________ thE proBlEm oF trAFFiC CongEstion, AnD somEtimEs thE trAFFiC ComEs to A ComplEtE stop in somE plACEs.
A．DEgrADED
B．AggrAvAtED
C．AmpliFiED
D．DiFFusED