A Disadvantage to Leaching Gold with Aqueous Solutions of Cyanide

Multiple Choice

A disadvantage to leaching gold with aqueous solutions of cyanide ion is that

A) it is a complicated process requiring more than two dozen separate steps.
B) it requires the use of ores with a very high concentration of gold.
C) sodium cyanide is very expensive.
D) the method is a potential environmental hazard.
E) the method does not produce gold of high enough purity.