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Gaokao Math Practice Question

以抛物线 $C$ 的顶点为圆心的圆交 $C$ 于 $A$、 $B$ 两点, 交 $C$ 的准线于 $D$、 $E$ 两点. 已知 $|A B|=4 \sqrt{2},|D E|=2 \sqrt{5}$, 则 $C$ 的焦点到准线的距离为 ($\qquad$)

  1. A.2
  2. B.4
  3. C.6
  4. D.8

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