Why Did the First Bacteria to Evolve Use Anoxygenic Metabolism

Why did the first bacteria to evolve use anoxygenic metabolism?

A) Because molecular oxygen was not present at high enough levels for oxygenic metabolism until after the action of oxygen-producing photosynthetic bacteria increased atmospheric levels
B) Because the Earth's surface was too warm for oxidative phosphorylation to occur
C) Because C-fixation was not oxygen dependant
D) Because the TCA cycle had not yet evolved
E) Because the electron transport chain is oxygen sensitive and compartmentalisation had not yet developed to efficiently partition oxygen within the cell

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