Lillian wonders how fast a train can move around a particular curve before it falls off of the track. Which of the following is the best way for Lillian to figure this out?
A. Drive a train along a curve at different speeds until it falls off of the track.
B. Build a model train and track, and test one train going around one curve at different speeds.
C. Build a model train and track, and test one train going around several different curves at one speed.
D. Build a model train and track, and test different-sized trains going around one curve at the same speed.
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