Which of the following signal paths is most likely to experience high levels of absorption when the A-index or K-index is elevated?

The A-index and K-index are measurements of the Earth's geomagnetic field stability. When these indices are elevated, it indicates that a geomagnetic storm is occurring, usually caused by a high-speed solar wind stream or a coronal mass ejection interacting with the Earth's magnetosphere. Because charged solar particles are funneled by the Earth's magnetic field toward the magnetic poles, the most severe effects of geomagnetic storms are concentrated in the high latitudes near the auroral oval. Signals passing through these polar regions will experience extreme attenuation or complete absorption, making communication over these paths very difficult during high A- or K-index periods.