Concept:The atmosphere is made up of different gases, and the most abundant gas is the one that occupies the highest percentage of total volume.
Explanation:The composition of dry air by volume is approximately as follows.
Nitrogen is present at about
78%.
Oxygen accounts for about
21%.
Argon forms around
0.93% of the atmosphere.
Carbon dioxide is only about
0.04%.
Hydrogen is found in extremely small trace amounts.
These values clearly show that nitrogen has the largest share among all atmospheric gases.
Therefore, out of the gases listed in the question, nitrogen is the most abundant in total volume within the atmosphere.
Answer:C. nitrogen