Question

Oxygen gas is used to fill a balloon and a short time later the balloon is observed to only be half full. Explain this observation.
Responses
A The balloon leaks and the temperature went down.The balloon leaks and the temperature went down.
B More oxygen was added to the balloon and the temperature went up.More oxygen was added to the balloon and the temperature went up.
C The pressure outside the balloon went down and the pressure inside went down.The pressure outside the balloon went down and the pressure inside went down.
D The pressure outside the balloon went down and the temperature inside went up.