Which of the Following Is False Regarding Earth's Magnetic Field

Multiple Choice

Which of the following is false regarding Earth's magnetic field?

A) It causes magnetic particles in cooling magma to align with magnetic field lines.
B) Transition periods, during which reversals occur, last an average of about 4000 to 8000 years.
C) Earth's magnetic field will probably reverse in the next few thousand years.
D) A given field orientation can last billions of years.