The statement which is not correct about control of particulate pollution

• A.  In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed  
• B.  Gravity settling chamber removes larger particles from the air
• C.  Cyclone collector removes fine particles in the diameter range 5-20 microns
• D.  Wet scrubbers are used to wash away all types of particulates