The inert or noble gases are on the far side of the periodic table in group 18. Nitrogen is not a noble gas or in that group. You give three choices, inert, nonreactive, and reactive. Essentially, "inert" and "nonreactive" are the same thing. Even if you didn't know the to this question on a test, you can automatically eliminate these choices since they are the same answer, and they both can't be correct (assuming this is multiple choice). So that leaves you with reactive, which nitrogen actually is. Most commonly, nitrogen will just react with another atom of nitrogen (triple bonded in case you're interested).