Which of the following is the best method to make a racemic mixture of (+) and (–)–2,3-dibromobutane?
A) photochemical bromination of 2-bromobutane
B) addition of HBr to racemic 3-bromo-2-butene
C) addition of Br2 to cis-2-butene
D) addition of Br2 to trans-2-butene
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