E3C03:Which of the following signal paths is most likely to experience high levels of absorption when the A-index or K-index is elevated?
Direct answer summary (2024-2028 NCVEC pool)
The official correct answer for E3C03 is Through the auroral oval.
The key fact is Through the auroral oval. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.