The first $3$ terms in the expansion of ${(1 + ax)^n}$ $(n \ne 0)$ are $1, 6x$ and $16x^2$. Then the value of $a$ and $n$ are respectively

  • A

    $2$ and $9$

  • B

    $3$ and $2$

  • C

    $2/3$ and $9$

  • D

    $3/2$ and $6$

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