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.

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