9. Please choose the wrong statement regarding the nitrogen cycle mediated by bacteria.

(A) Azotobacter species fix nitrogen from the air, and the product of nitrogen fixation is ammonia.

(B) The anammox reaction is an aerobic process performed by bacteria in the phylum Planctomycetes, in which ammonium ion is oxidized to nitrogen gas using nitrite as the terminal electron acceptor.

(C) Nitrification by bacteria is a two-step process in which ammonium is oxidized to nitrite and then to nitrate.

(D) In denitrification, nitrates are reduced to nitrogen gas during anaerobic respiration.

(E) Bacteria of the genera Nitrobacter and Nitrococcus convert nitrite to nitrate.