What Is the Explanation of Earth's Magnetism

Multiple Choice

What is the explanation of Earth's magnetism?

A) Earth's magnetism a consequence of the world's physics professors all spinning in the same direction.
B) It is caused by a separation of charge within the Earth, with positive static charge residing at one of Earth's poles and negative static charge residing at the other pole.
C) Subatomic particles known as "magnetic poles" reside in the Earth, with one type of magnetic pole residing at Earth's north pole and the other type of magnetic pole residing at Earth's south pole.
D) It is caused by electrically charged material circulating within Earth's hot liquid core.
E) It is caused by charged, or ionized, particles circulating in the air above the solid Earth.