Answer choice B is Correct.

An increase in entropy involves an increase in randomness. Choice A is eliminated because it involves purification and separation of stereoisomers. The reaction of a D-amino acid with an achiral species neither increases nor decreases the entropy. In choice D, a solute is converted into a solid, which involves a decrease in entropy. The only increase in entropy occurs when one enantiomer is racemized into a mixture of two enantiomers.