Final answer:
Running an electric current through a magnet can create a magnetic field.
Step-by-step explanation:
The correct statement is option a: Running an electric current through a magnet can create a magnetic field.
According to the information provided, all electric motors and generators contain magnets, which produce magnetic fields. This is also true for other applications such as recycling facilities, magnetic resonance imaging (MRI), and levitation of high-speed trains.
Therefore, running an electric current through a magnet can indeed create a magnetic field.