Magnetic stripes on the seafloor are caused in part by:

a. declination of the poles.
b. tidal forces.
c. movement of ocean crust.
d. gravity.

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Option C, movement of ocean crust.

Explanation:

When ocean crust are moved apart from each other , the magma with in the earth crust rises to the surface of mid-ocean ridges. This magma being unstable is spilled off. All ferromagnetic minerals with in the earth crust align themselves along the spilled hot magma thereby reversing its north-to-south polarity very frequently. As the magma cools down the polarity gets constant and confined. Later on when the  magnetic field flips again, new ocean floor again aligns its polarity in opposite direction.

Hence, option c is correct.

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