The image below is a sketch of two-slit diffraction of light. Narrow slits at A and B act as wave sources, and waves interfering in various phases are shown at C, D, E, and F.

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

the higher the current the higher the mag field around it the higher the influence on the compass

i think its c if i'm wrong