From the following transformations,
A. Epoxidation of alkene
B. Diol dehydrase reaction
C. Conversion of ribonucleotide-to-deoxyribonucleotide
D. 1, 2-carbon shift in organic substrates
those promoted by coenzyme B12 are
1
A and B
2
B, C and D
3
A, B and D
4
A, B and C
5
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