The coefficient of the term independent of $x$ in the expansion of ${\left( {\sqrt {\frac{x}{3}}  + \frac{3}{{2{x^2}}}} \right)^{10}}$ is

  • A

    $5/4$

  • B

    $7/4$

  • C

    $9/4$

  • D

    none of these

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