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Height
Option B is correct
Explanation:The roller coaster is a railway with a large height and steep inclines that is basically found in the amusement park for carrying a train of people for a fun ride.
The speed of the roller coaster is determined by a number of factors such as the energy input, drag force, temperature, mass, etc.
The height at which the roller coaster is released when launched determines greatly the speed of the motion of the roller coaster