8.
如图,矩形ABCD中,3AB=2AD,沿对角线BD折叠,得△BED,BE与AD交于点F,则$\frac{AF}{FD}$等于( )
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| A. | $\frac{2}{5}$ | B. | $\frac{5}{13}$ | C. | $\frac{1}{3}$ | D. | $\frac{2}{7}$ |