Which reaction would yield a racemic product?

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Which reaction would yield a racemic product?a)Cyclopentene + OsO4, then Na2SO3 →b)Cyclopentene + cold, dilute KMnO4 →c)Cyclopentene + D2/Pt →d) Cyclopentene + Br2/H2O →e) Cyclopentene + dilute H2SO4 →

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