If the ${p^{th}},\;{q^{th}}$ and ${r^{th}}$ term of an arithmetic sequence are $a , b$ and $c$ respectively, then the value of $[a(q - r)$ + $b(r - p)$ $ + c(p - q)] = $

  • A

    $1$

  • B

    $- 1$

  • C

    $0$

  • D

    $1/2$

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