The Bacteria A

The bacteria A. vinelandii uncouples oxidative phosphorylation during nitrogen fixation for what reason?

A) It increases the temperature so that the enzymes will function at maximum efficiency.
B) It ensures that the citric acid cycle is fully active and providing substrates for nitrogen fixation.
C) It ensures that ATP is not present to inhibit nitrogen fixation.
D) It maintains a low level of reduced cofactors.
E) It ensures that oxygen concentrations are kept low to prevent interference with enzymes.