How Does the Ocean Floor Preserve Evidence of Past Magnetic

How does the ocean floor preserve evidence of past magnetic reversals?

A) Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened.
B) Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.
C) The ocean floor is uniformly old,preserving the Earth's 4.6 billion history.
D) Mantle hot spots are always oriented to the magnetic field.
E) The oldest oceanic crust is always found near mid-ocean ridges.As one moves out from these ridges,the crust is simultaneously younger and oriented according to the polarity at the time.

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