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(B) The reaction shown is the syn-dihydroxylation of an alkene using $OsO_4$ (often complexed with pyridine). This process adds two hydroxyl $(-OH)$ g

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(B) The reaction shown is the syn-dihydroxylation of an alkene using $OsO_4$ (often complexed with pyridine). This process adds two hydroxyl $(-OH)$ groups across the double bond in a syn-fashion. Since the starting material is a $1,2-$dimethylcyclopentene derivative,the two $-OH$ groups will be added to the same face of the ring,resulting in a cis-diol. Looking at the options,option $(B)$ represents the cis$-1,2-$dihydroxy$-1,2-$dimethylcyclopentane structure where the hydroxyl groups are on the same side of the ring.

Product $(A)$ is

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