Which best describes the atmosphere of the early Earth?

A. Little to no oxygen, mostly carbon dioxide, water vapor, and nitrogen.
B. Little or no carbon dioxide, mostly oxygen, water vapor, and nitrogen.
C. Little or no water vapor, mostly oxygen and carbon dioxide, with some nitrogen.
D.Large amounts of hydrogen cyanide with low amounts of carbon dioxide and oxygen.

Helppp I had this last question on my biology 1 notes and I have a dba today!!!!!!!