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The horizontal component of the Earth's magnetic field…

  • A

    weakens with increasing distance from the magnetic poles.

  • B

    is approximately the same at all magnetic latitudes less than 60°.

  • C

    is approximately the same at magnetic latitudes 50°N and 50°S.

  • D

    weakens with increasing distance from the nearer magnetic pole.

Refer to figure.
The magnetic meridians (lines) flow from the North magnetic pole to the South magnetic pole and they can never cross each other. Each line forms a closed-loop from North to South and all together they constitute the Earth’s magnetic field. Therefore, the strength of the horizontal component will always be almost equal but opposite (since it’s a closed-loop) at the same latitude in both hemispheres.

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