The coefficient of $x^{19}$ in the polynomial $(x-1)(x-2^1)(x-2^2) \dots (x-2^{19})$ is:

  • A
    $2^{20} - 1$
  • B
    $-(2^{20} - 1)$
  • C
    $2^{20}$
  • D
    None of these

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