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until recently, it has been difficult for some people to use buses or other forms of public transportation. even when special buses were available, it took extra time and effort to let physically challenged people on and off, causing delays and embarrassment. now a bus can let any passenger get on and off easily. the no-step system is convenient to useand promotes the idea that we are all equally valued in society.

이 글의 제목으로 가장 적절한 것은?
1. way to increase buses
2. the popularity
3. no-step buses for everyone
4. the various forms of public transportation
5. special buses fo physically challenged people

정답은 5번인데 제 생각으로는 3번이 더 맞지 않나싶어서요.
고1 천재 김덕기 8과 본문중에 나온 글입니다. 작년 모학교 기출문제이더군요..