T3C09

What is generally the best time for long-distance 10-meter band propagation via the F region?

1. AFrom dawn to shortly after sunset during periods of high sunspot activity
2. BFrom shortly after sunset to dawn during periods of high sunspot activity
3. CFrom dawn to shortly after sunset during periods of low sunspot activity
4. DFrom shortly after sunset to dawn during periods of low sunspot activity

Pick an answer to check it.