Write the dimensions of $a/b$ in the relation $P = \frac{{a - {t^2}}}{{bx}}$ , where $P$ is pressure, $x$ is the distance and $t$ is the time 

  • A

    ${M^{ - 1}}{L^0}{T^{ - 2}}$

  • B

    ${M^1}{L^0}{T^{ - 2}}$

  • C

    ${M^1}{L^0}{T^{ 2}}$

  • D

    ${M^1}{L^1}{T^{ - 2}}$

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