TOEFL Listening: ETS-TOEFL听力机经 - B81881FA39S4LY19P$

Why did Michelangelo choose to build footbridges rather than traditional scaffolding when he painted the chapel? A. To accommodate the curved shape of the chapel's ceiling B. To keep the floor clear for ceremonies in the chapel C. To reach both the walls and the ceiling of the chapel D. To paint while lying on his back for long periods of time