What kind of reagent would be needed to resolve a racemic amine, such as 2-aminobutane ?

• A. the pure optically active amine to serve as a template for crystallization
• B. an achiral carboxylic acid to give a racemic mixture of amine salts.
• C. An enantiomerically pure chiral carboxylic acid to give a diastereomeric mixture of amine salts.
• D. A racemic chiral carboxylic acid to give a complete mixture of isomeric amine salts.