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Many shopers use an inclined plane to get to the second level in a mall. According to the passage, this would mean that they are most likely traveling by ____.

A escalator
The article states that an inclined plane is like a ramp. An elevator is incorrect because it goes straight up and down and is not on an incline. Doors in upper parking lots give access but on a level plane. Tunnels are not inclined and they do not generally go up.
B elevator
C access doors on upper parking lots
D tunnel