For an integer $n \geq 2$,if the arithmetic mean of all coefficients in the binomial expansion of $(x+y)^{2n-3}$ is $16$,then the distance of the point $P(2n-1, n^2-4n)$ from the line $x+y=8$ is:

  • A
    $\sqrt{2}$
  • B
    $2\sqrt{2}$
  • C
    $5\sqrt{2}$
  • D
    $3\sqrt{2}$

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