Regardint the isolation of noble gases from atomosphric air by Ramsay - Rayleigh's second method four equations are given below
I) `N_2 + O_2 + 2NO` II) `2NO + O_2 to 2NO_2`
III) `2NO_2 + 2NaOH to NaNO_2 + NaNO_3 + H_2O` IV) `CaC_2 + N_2 overset(Delta)to CaCN_2+ C`
In this method, the reactions truely involved are

Options

A. Both I and II
B. Both II and III
C. I, II and III
D. III and IV

Answer

C