All of the Following Statements Are True EXCEPT

All of the following statements are true EXCEPT:

A) aluminum oxide is very abrasive; it is what sandpaper is made of.
B) if there is aluminum oxide in the cooling system, it looks like black sand beads.
C) when flushing a cooling system with aluminum oxide contamination, heat the engine to operating temperature and reflush the system at least three times, heating to full temperature each time.
D) using a commercial chemical cleaner, the radiator can be flushed but it must be removed from the car.