11.
如图,在△ABC中,AB=6,BC=3,CA=7,I为△ABC的内心,连接CI并延长交AB于点D.记△CAI的面积为m,△DAI的面积为n,则$\frac{m}{n}$=( )
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| A. | $\frac{3}{2}$ | B. | $\frac{4}{3}$ | C. | $\frac{5}{3}$ | D. | $\frac{7}{4}$ |