$A$ body is moving according to the equation $x = at + bt^2 - ct^3$,where $x$ is displacement and $a, b,$ and $c$ are constants. The acceleration of the body is:

  • A
    $a + 2bt$
  • B
    $2b + 6ct$
  • C
    $2b - 6ct$
  • D
    $3b - 6ct^2$

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