Part of the Bayer Process Involves the Digestion of Crushed

Part of the Bayer process involves the digestion of crushed ore in concentrated aqueous sodium hydroxide. This process carried out at high pressure .

A) to prevent formation of aluminum hydroxide
B) to prevent boiling
C) to accelerate formation of iron hydroxide
D) to lower the boiling temperature of the mixture
E) to prevent formation of iron hydroxide