Read this topic sentence.

Taking the bus to work is a matter of responsibility for some energy-conscious folks.

Which of these is MOST CLOSELY related to the topic sentence?
A) They gladly trade the stress of driving in traffic for a period of uninterrupted reading or relaxed people watching.
B) just knowing how much gasoline is being saved by all the people sitting on the bus instead of driving in their cars makes them feel good.
C) People have realized that traveling by bus to work is a good method of saving money on gasoline.