To Generate a Planetwide Magnetic Field Requires a Body to Rotate

Multiple Choice

To generate a planetwide magnetic field requires a body to rotate and to contain some liquid that is electrically conductive. What is believed to be the source of the magnetic field of Enceladus?

A) molten nickel-iron, as on Earth
B) salty ice water
C) liquid metallic hydrogen, as on Saturn
D) Enceladus is too small to generate its own magnetic field, so this must be an induced field, caused by the presence of Saturn.