Question

Which gas makes up most of Earth's atmosphere?

Answer 1

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

Answer 2

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%)