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 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

$RC{O}_{3}H$

$H_3{O}^{+}$

D

$HBr,\frac{R}{O}OR$

B

$KMn{O}_4$

NaOH, cold

C

$RC{O}_{3}H$

F

$t-$BuOK

$B{H}_3*THF$

$H_2{O}_2,H_{2}O$