Why Does the Formation of Salts of a Racemic Mixture

Multiple Choice

Why does the formation of salts of a racemic mixture of N-acetyl valine with a single enantiomer of a-methylbenzylamine enable the separation of the two enantiomers of N-acetyl valine?

A) They form amides.
B) They form diastereomers.
C) They form salts.
D) They form meso compounds.