听力原文：A: Many people prefer taking public buses or the subway or even taxis because parking is getting to be a real headache in some parts of the city.
B: That doesn't surprise me.
What conclusion can we draw from this conversation？
A. Public buses are fast and cheap.
B. Parking is becoming a big problem.
C. Subway trains are even safer than taxis.
D. Taxis are more convenient than buses.
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