I believe the correct answer from the choices listed above is option C. <span>Most of Earth’s dry air is made up of nitrogen and oxygen. Approximately, air is made up of 21 percent of oxygen and 79 percent of nitrogen. Hope this answers the question. Have a nice day.</span>
I think the answer is non reactive. As the outer shells gets filled ,valency decreases, so reactivity also decreases.
All the best
