Which statement BEST describes how magnetic forces can be harnessed to increase the speeds at which trains go? Select one:

Magnetic forces can be used to create the electricity the train needs for a power source.

Magnetic forces increase the attraction between the tracks and the wheels so that the trains do not fly off the tracks at high speeds.

Magnetic forces create a positively charged field; the negatively charged train wheels are repulsed and this force drives the train forward.

Magnetic forces can raise the trains off the track, reducing frictional forces acting against the train; less work is needed to propel the train.