G3A03:Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?
Direct answer summary (2023-2027 NCVEC pool)
The official correct answer for G3A03 is 8 minutes.
The key fact is 8 minutes. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.