The two structures shown (left and right) are stereoisomers of 2,3-dibromobutane. They are related as

Aidentical (same compound)
Benantiomers
Cdiastereomers
Dconstitutional isomers

Answer: B

Assigning CIP descriptors, the left structure is (2S,3S)-2,3-dibromobutane and the right one is (2R,3R). Every stereocentre is inverted on going from one to the other, so the two are mirror images. Neither has an internal mirror plane (both centres carry the same descriptor), so the mirror images are not superimposable: they are enantiomers.

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