I agree that these are all equally valid options. The trick is to be logical and go for any option that is SAFE and can be justified. Don't over complicate it just go for a reasonable answer based on the information you have, and don't be afraid to ask for more information.
FYI, a girl at my interview day was asked 'You have a 747, a 737 low on fuel, a royal flight and an Air ambulance all arriving at the airfield at the same time. Which do you land as a priority?' Without a seconds thought she answered 'The 747 because that way I kill the least people.'
I never saw her again....
