Answer : The correct option is, (d) nitrogen and oxygen.
Explanation :
As we know that there are many elements present in the earth's atmosphere.
In the earth's atmosphere, 78 % of nitrogen, 21 % of oxygen and 1 % of carbon dioxide, argon, water vapors and other gasses are present.
The combined percentage of nitrogen and oxygen is, 99 %. That means about 99 % of the atmosphere is composed of nitrogen and oxygen.
Hence, the correct option is, (d) nitrogen and oxygen.
