A student places two horseshoe magnets next to each other, and the poles of the magnets attach to each other. How does the kinetic energy of the system change?

Kinetic energy increases because the magnets move in the opposite direction of the field.
Kinetic energy decreases because the magnets move in the direction of the field.
Kinetic energy increases because the magnets move in the direction of the field.
Kinetic energy decreases because the magnets move in the opposite direction of the field.

Kinetic energy decreases because the magnets move in the opposite direction of the field.