Which of the following quotes from the passage best supports the idea that rolller coasters have changed significantly since the 1950s? A With steel coasters, though, the structures are made of lighter steel, the wheel mechanisms are more complicated, and the coaster can move in many different directions

B Regardless of type, all coasters run in fundamentally the same way, as they rely not on an independent engine or power source like a train would, but are instead moved by gravity.

C Because roller coasters are meant to thrill riders, safety has always been a concern for both riders and park employees.

D The physical forces at play, no matter what type of roller coaster, are amazing, as they act on all parts of the body.​