Propose an efficient synthesis for the following transformation:

The transformation above can be performed with some regent 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$.$ MCPBA$(RC{O}_{3}H)$

C$.1)$

$H_3{O}^{\text{'}}$ workup

$H_3{O}^{+}$workup

D$.Mg$

E$.1)B{H}_3-$THF; $2)H_2{O}_2,$NaOH

F$.$ DMP or PCC

G$.SOC{l}_2,$ py

H$.1)PhMgBr$; $2)H_3{O}^{+}$

I. $N{a}_{2}C{r}_2{O}_7,H_{2}S{O}_4,H_{2}O$