(B) Lactic acid is $CH_3-CH(OH)-COOH$.It contains only one chiral center.Hence,two optical isomers (enantiomers) are possible.The number of optical is

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(B) Lactic acid is $CH_3-CH(OH)-COOH$.It contains only one chiral center.Hence,two optical isomers (enantiomers) are possible.The number of optical isomers is given by the formula $2^n$,where $n$ is the number of chiral carbon atoms.For lactic acid,$n = 1$,so the number of optical isomers = $2^1 = 2$.