7. Which of the following is the definition of a pair of enantiomers?
(A) A pair of structures that are superimposable mirror images of one another
(B) A pair of stereoisomers that are non-superimposable mirror images of one another
(C) A pair of stercoisomers that are not mirror images of one another
(D) A pair of stereoisomers that have equal specific rotations
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