Which One of the Following Statements Is TRUE for Earth

Multiple Choice

Which one of the following statements is TRUE for Earth?

A) The oxygen in our atmosphere was created by evaporation of seawater,allowing life to move from the seas onto dry land.
B) Earth has always had an oxygen-rich atmosphere,which was one reason life could develop.
C) Outgassing by volcanic eruptions converted the carbon-dioxide-rich atmosphere into an oxygen-rich atmosphere,thus creating conditions in which life could develop.
D) Life developed in a carbon-dioxide-rich atmosphere,and life helped convert this into an oxygen-rich atmosphere.