The best evidence to support the central idea that "Roller coasters are designed by engineers who harness the power of physics to deliver an exhilarating experience for theme park enthusiasts" is:
Potential energy turns to kinetic energy as gravity pulls the roller coaster along the track.
This statement directly relates to the application of physics in the design of roller coasters, highlighting how engineers use principles of potential and kinetic energy to create the thrilling experiences that riders enjoy.