Recent Evidence Suggests That Mars Once Had a Global Magnetic

Recent evidence suggests that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?

A) Mars is too far from the Sun to have a global magnetic field.
B) Mars rotates much slower than the Earth.
C) The Martian core is made of rock, while Earth's core is made of metal.
D) Mars's interior has cooled so much its molten core layer no longer undergoes convection.

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