In some appropriate units,the time $(t)$ and position $(x)$ relation of a moving particle is given by $t = x^2 + x$. The acceleration of the particle is

  • A
    $-\frac{2}{(x+2)^3}$
  • B
    $-\frac{2}{(2x+1)^3}$
  • C
    $+\frac{2}{(x+1)^3}$
  • D
    $+\frac{2}{2x+1}$

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