In which of the following reactions is the position of equilibrium not affected by an increase in pressure?

A. 3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g)
B. 2NO2(g) ⇌ N2O4(g)
C. 3H2(g) + N2(g) ⇌ 2NH3(g)
D. 2SO2(g) + O2(g) ⇌ 2SO3(g)

Correct Answer: Option A

A. 3Fe(s) + 4H2O(g) ⇌ Fe3O4(s) + 4H2(g)