In the Reaction of Nitrogen Gas with Oxygen Gas to Produce

In the reaction of nitrogen gas with oxygen gas to produce nitrogen oxide, what is the effect of adding more oxygen gas to the initial reaction mixture? The reaction is shown below.
N2(g) + O2(g) ⇌ 2NO(g)

A) The equilibrium shifts to produce more N2.
B) The equilibrium shifts to produce more NO.
C) The equilibrium is not affected.
D) Extra catalyst is required to reach equilibrium.
E) The temperature of the reaction mixture is raised.