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Gaokao Math Practice Question

双曲线 $C$ 的两个焦点为 $F_{1}, F_{2}$, 以 $C$ 的实轴为直径的圆记为 $D$, 过 $F_{1}$ 作 $D$ 的切线与 $C$ 的两支交于 $M, N$ 两点, 且 $\cos \angle F_{1} N F_{2}=\frac{3}{5}$, 则 $C$ 的离心率为 ($\quad$)

  1. A.$\frac{\sqrt{5}}{2}$
  2. B.$\frac{3}{2}$
  3. C.$\frac{\sqrt{13}}{2}$
  4. D.$\frac{\sqrt{17}}{2}$

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