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Propose an efficient synthesis for the following transformation: The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagents in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer. A. H3O+, heat B. SOCl2 C. CH3CO2Na D. 1) sCH3MgBr;2)H3O+ E. CH3COCl, pyridine F. Mg