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200 - Hot Air Balloon Exam Prep - What is the gas composition of "air"?

Question 200 - Meteorology - BPL Hot Air - Balloon Pilot License

Oxygen 78 % Water vapour 21 % Nitrogen 1 %
Oxygen 21 % Water vapour 78 % Noble gases / carbon dioxide 1 %
Nitrogen 21 % Oxygen 78 % Noble gases / carbon dioxide 1 %
Oxygen 21 % Nitrogen 78 % Noble gases / carbon dioxide 1 %

Training tests and timed exam simulations BPL Hot Air - Balloon Pilot License