16.
如图,菱形ABCD的边长为2,较短的对角线BD的长为$\sqrt{7}$,P是BD上一点,PE∥AB,PF∥AD,分别交菱形两边于点E、F,则图中阴影部分面积为( )
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| A. | $\frac{3\sqrt{6}}{4}$ | B. | $\frac{3\sqrt{7}}{2}$ | C. | $\frac{3}{4}$ | D. | $\frac{3\sqrt{7}}{4}$ |