Propose an efficient synthesis for the following transformation: (f) 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. B. C. D. 1) CH3MgBr;2)H3O+ E. Br2,FeBr3 F. Ph3P=CH2 G. HBr,ROOR H. Br2, hv I. conc. H2SO4, heat