A because when it says that “you’re not in control of gravity anymore,” it suggests that someone is flying in mid air.
A blimp needs to be moored when not flying because plenty of space is needed so the blimp has to be free. They have to be moored by the front end to a tall mast on a truck specially equipped for this purpose.
I have Aviation History so I kinda of undertsnd.
HOPE THIS HELPS. :)
Answer: Hello! I think your answer D.
Hope this helps.