fact문제를 푸는데요
The Otis Elavator Company developed a high-speed, gearless electrical contraption that was based on a relatively
simple design similar to a pulley lowering a bucket on a rope into a well.
위에 밑줄 친 문장 때문에 B)It was modeled on a pulley 를 골랐는데 오답이였어요
다른 의미인가요? 왜 정답이 안되져ㅠ