8.
如图,在△ABC中,AB=AC=2,∠ABC=30°,点P、Q分别在边AB、AC上,将△APQ沿PQ翻折,点A落到点A′处,则线段BA′长度的最小值是( )
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| A. | 2$\sqrt{3}$-2 | B. | 2 | C. | $\sqrt{3}$ | D. | $\sqrt{2}$ |