Use the Following Choices to Answer the Atmosphere Composition Questions

Use the following choices to answer the atmosphere composition questions:
-Which best describes the composition of the atmosphere of Mars?

A) mostly carbon dioxide
B) individual atoms,such as sodium and potassium
C) mostly molecular nitrogen,with a lesser amount of molecular oxygen
D) mostly molecular oxygen,with a lesser amount of molecular nitrogen
E) mostly methane,with a lesser amount of carbon dioxide