(B) $CH_3-CH(OH)-COOH$ (Lactic acid) contains a chiral carbon atom (asymmetric carbon) attached to four different groups: $-H$,$-OH$,$-CH_3$,and $-COO

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(B) $CH_3-CH(OH)-COOH$ (Lactic acid) contains a chiral carbon atom (asymmetric carbon) attached to four different groups: $-H$,$-OH$,$-CH_3$,and $-COOH$. Therefore,it exhibits optical isomerism. It does not have a double bond with restricted rotation,so it does not show geometrical isomerism.