How does a maglev train move forward?

Question

A. Magnets in front of the train constantly pull magnets in the train toward them
B. Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train C. The magnets that cause the train to levitate constantly switch on and off.
D. Magnets behind the train constantly push magnets in the train forward

Answer 1

B. Magnets in the sides of the tracks constantly repel and attract magnets in the sides of the train