A Certain Wastewater Treatment Plant Uses Aerobic Bacteria,anaerobic Bacteria,and Archaebacteria

A certain wastewater treatment plant uses aerobic bacteria,anaerobic bacteria,and archaebacteria during secondary treatment of sewage.Unfortunately,during a bad blizzard the aerated tanks froze,killing the microbes inside.What is likely to result?

A) Floc levels will diminish.
B) Methane production will go down.
C) Solid material will not be effectively filtered out.
D) Floc will not be effectively filtered out.