The Thermochemical Equation for the Formation of Ammonia from Elemental $~~~~~~~~$

Multiple Choice

The thermochemical equation for the formation of ammonia from elemental nitrogen and hydrogen is as follows.
N₂(g) + 3 H₂(g) 2 NH₃(g) $~~~~~~~~$ $~~~~~~~~$ $\Delta$ H = -92.2 kJ
Given a system that is initially at equilibrium,which of the following actions cause the reaction to proceed to the left?

A) adding N₂(g)
B) removing NH₃(g)
C) adding a catalyst
D) decreasing the temperature
E) removing H₂(g)