Which of the Following Techniques Could Not Be Used to Resolve

Which of the following techniques could not be used to resolve a racemic mixture of organic acids?

A) React the mixture with brucine and separate the salts.
B) Crystallize the acids and manually separate the crystals.
C) React the acids with ammonia and separate the salts.
D) Elute a solution of the acids through a column containing a chiral stationary phase.
E) React the mixture using an enzyme as a catalyst.