I'm pretty sure the answer is D but it's been a while since I've studied this. 95% sure it's D though :)
Answer:
D. magnetic polarity reversals
Explanation:
The marine magnetic anomalies are the result of two things; the seafloor spreading at the mid-ocean ridges and the magnetic polarity reversals.
The mid-ocean ridges are the places where the new crust forms. This places also have big influence on the magnetic anomalies, with the reason being that the magnetism has higher influence in this parts.
Also, the magnetic polarity reversals play a big role. The Earth has not always had the same magnetic polarity, and multiple times throughout its past the North and South Poles have been switching places when it comes to the magnetism.
The igneous rocks on the ocean floor have proof in them about this, as the metallic components are reacting to the magnetism and face toward the stronger magnetic field.
Determined by tectonic plate locations and types of plates - they occur on divergent, transform and convergent plate boundaries. Great example is Japan and the San Andreas fault; abundant in plate activity and historically notable for frequent earthquakes. Hope this helps you get started a bit! :)
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