Magnetic reversals
a. cause the movements of tectonic plates
b. confirmed the existence of subduction zones
c. provide strong evidence for seafloor spreading
d. have never occurred during geologic time

The answer is C.

Seafloor spreading occurs at diverging tectonic plates boundaries (such as at mid-ocean ridges). When magma upwells to fill up the void, the iron in the magma aligns itself with earth’s magnetic fields  before the magma cools to new crust. Since earth's north and south switch polarity over several centuries, the iron in newly formed crust will align opposite from the previously formed crust. These reversals can be used to prove that the bands of the new crust were laid at different times.

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