Since the Earth Is Approximately 4

Since the earth is approximately 4.5 billion years old, which of the following is true regarding life on this planet?

A) life forms that arose 3.8 billion years ago were able to synthesize the building blocks of life from non-organic molecules
B) the earliest organisms on this planet were anaerobic
C) the oxygen in the earth's atmosphere was originally trapped in ice and thus unavailable for living organisms
D) all multi-cellular anaerobic organisms died out as oxygen became more plentiful
E) none of the above