no answer this one

Propose an efficient synthesis for the following transformation: OH Ph H Ph Ph Ph The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagent(s) 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 1) MeMgBr 1) PhMgBr 1) EtMgBr 2) H3Ot 2) HaOt 2) HaOt D E F H20, H2SO4, NazCr207, 1) R2BH HgSO4 H2SO4, H20 2) H202, NaOH