The correct option is D

Direct $B r_{2}$ addition gives trans product.
Hence A is

Trans-1, 2-Dibromo Cyclohexane

The other addition using $O s O_{4}$ and $H_{2} O_{2}$ is syn dihydroxylation. The product will be cyclohexane-1,2-diol.

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The correct option is D Direct Br2 addition gives trans product. Hence A is Trans-1, 2-Dibromo Cyclohexane The other addition using OsO4 and H2O2 is syn dihydroxylation. The product will be cyclohexane-1,2-diol.