Verified Answer :

answer is option C. nitrogen as:-
          
                OXYGEN- 21%
                NITROGEN- 78%
                 CARBON DIOXIDE, ARGON, NEON and SEVERAL OTHER                       GASES- 1%

namekianball4

The answer is C. nitrogen

Nitrogen makes up most of Earth's atmosphere.

Oxygen: 21%

Nitrogen: 78%

Other including Argon (0.9%) and Carbon Dioxide (0.03%)

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