Pls explain how c?

dear student
A gas which can be most easily liquefied can be easily adsorbed.
NH3 due to hydrogen bonding can easily be liquefied hence has high volume of gas adsorbed.
then comes the CO2 which is also having strong dipole interaction between its molecules but weaker than hydrogen bonding and then comes CH4 which is moderately adsorbed and then the gases H2 and He which are least adsorbed 
hence the order is He < H2 < CH4 < CO2 < NH3​​​​​​​​
which is option c
regards

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