The correct option is D both A and B
d-lactic acid and l-lactic acid are optical isomers and also enantiomers (Enantiomers are chiral molecules that are mirror images of one another. The molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers).
Hence option D is correct