In the FAR… It states that any aircraft in a VFR Flight must remain above 3,000 ft above the surface (AGL) but below 18,000 ft Mean Sea Level (MSL).
So with that, would Both A and B be correct?
Yet again, most aircraft that are under VFR Flight Rules are Cessnas and other recreational/private aircraft… They require oxygen around 14,000 ft (Depending on pressure, temperature, etc)
So they won’t really ever get to 18,000 ft MSL.
Can you verify this?
Information can be found in Part 91 in the FAR Handbook. (General Operating and Flight Rules)