Assume That a New Family of Bacteria Species Evolves and Becomes

Assume that a new family of bacteria species evolves and becomes widespread,and that it rapidly and easily combines atmospheric oxygen with previously stable minerals.What would you reconsider about the oxygenation of the atmosphere several billion years ago?

A) that it was a negative feedback
B) that it was an irreversible process
C) whether it really resulted in globally cooler temperatures.
D) that it did not really occur for the reasons that we think