Why should liquid gas bottles for hot-air balloons be transported upright?

Question

Question Quiz BPL Hot Air - Balloon Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

To prevent damage on the riser tube.

QuizVDS · Answer

Because no other positions are approved.

QuizVDS · Answer

To prevent exiting of residual gas.

QuizVDS · Answer

To keep the armature panel clean.

Id 69 - BPL Hot Air - Why should liquid gas bottles for hot-air balloons be transported upright?