If the graph of $y = ax^3 + bx^2 + cx + d$ is symmetric about the line $x = k$ then

  • A

    $k=c$

  • B

    $k = -\frac{c}{b}$

  • C

    $a + \frac{c}{{2b}} + k = 0$

  • D

    none of these

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