Carbon-Oxygen
We breathe in oxygen, we breathe out carbon dioxide.
This would happen because the pressure on Mt.Everest is much more higher than the pressure at sea level, the can would probably be swollen so to this too.
The will be c. Covalent bond and
Number of mole : mass/ molar mass
87g/ (2 x 16) = 2.719 mol
volume = number of mole x molar volume
volume = 2.719 x 22.4
volume = 60.906 L