$A$ force is represented by $F = ax^2 + bt^{1/2}$,where $x$ is distance and $t$ is time. The dimensions of $b^2/a$ are:

  • A
    $[ML^3 T^{-3}]$
  • B
    $[MLT^{-2}]$
  • C
    $[ML^{-1} T^{-1}]$
  • D
    $[ML^2 T^{-3}]$

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