Among the following gases which gas has the highest Henry’s law constant, K_H value in water at the same temperature ?

According to Henry's law constant,' for a given external pressure of a gas, its solubility is inversely proportional to Henry's law constant, i.e, higher the value of K_H​, lower the solubility.

$\mathrm{S}\propto \frac{1}{{\mathrm{K}}_{\mathrm{H}}}$

Henry law constant for helium is highest and lowest for oxygen. The order is :

He>N₂​>H_2​>O₂​