Which of the following statements BEST explains the relationship between the loop-the-loop and the lift hill based upon information from "Roller Coaster Physics"?

A : roller coaster must be designed with multiple hills to create enough speed for
a car to complete a loop-the-loop.

B: roller coaster must have a lengthy straightaway before a loop-the-loop in
order for a car to build enough speed to complete a loop-the-loop.

C: The higher the lift hill is, the greater the acceleration and speed will be; speed is
necessary for a car of a roller coaster to successfully complete a loop-the-loop.

D: The hills of the coaster must increase in height in order to create the
acceleration needed for the coaster to enter and exit a loop-the-loop with
sufficient speed.