Volcanic rock shows that some layers have magnetic fields that are aligned opposite to Earth’s. This evidence BEST fits which hypothesis?

Question

Responses
A Earth's rotation has reversed in the past.Earth's rotation has reversed in the past.
B Earth's magnetic field has reversed in the past.
Earth's magnetic field has reversed in the past.
C Earth did not have a magnetic field until recently.Earth did not have a magnetic field until recently.
D Earth's magnetic field has always had the same orientation.Earth's magnetic field has always had the same orientation.

Answer 1

The evidence that some layers of volcanic rock show magnetic fields aligned opposite to Earth’s BEST fits the hypothesis:

B. Earth's magnetic field has reversed in the past.

This phenomenon is known as geomagnetic reversal, where the magnetic north and south poles switch places. The layers of volcanic rock preserve these magnetic orientations, which provide evidence for this process occurring over geological time.