The Haber process involves an equilibrium reaction:
N₂(g) + 3H₂(g) ↔2NH₃(g), ∆H = -kJ
The reaction is carried out at 450 ° C and 250 kPa with an iron catalyst. Why is a catalyst used?

A) To increase reaction rate
B) To decrease reaction rate
C) To change the equilibrium constant
D) To alter the stoichiometry