If for $p \neq q \neq 0$,the function $f(x) = \frac{\sqrt[7]{p(729+x)}-3}{\sqrt[3]{729+qx}-9}$ is continuous at $x=0$,then:

  • A
    $7pqf(0)-1=0$
  • B
    $63qf(0)-p^2=0$
  • C
    $21qf(0)-p^2=0$
  • D
    $7pqf(0)-9=0$

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