The correct option is C Kp of the reaction remains unaffected with increase in pressure of the system
The equilibrium constant of a reaction is independent of pressure of the system. Since the reaction involves increase in the gaseous species, increasing pressure will favour the formation of more amount of NH3(g).
As per Le - chatelier principle,
when pressure is increased, reaction shift where the number of moles decreases. In this reaction, number of moles of product are more so reaction will shift towards the backward reaction.
Since, stoichiometry of the reaction gives that amount of H2 formed will be more than amount of N2.