Which of the Following Statements Concerning Magnesium Is False

Which of the following statements concerning magnesium is false?

A) Milk of magnesia is composed of a slurry of magnesium hydroxide.
B) Combustion of magnesium produces an intense white light.
C) Carbon dioxide may be used to put out magnesium fires.
D) Magnesium hydroxide is relatively insoluble in water.
E) Firebricks are a hardened form of magnesium oxide.