If $p^3 = q^4 = r^6 = t^7 = s^2$,then $\log_t(pqrs) = \ldots$.

  • A
    $\frac{168}{5}$
  • B
    $28$
  • C
    $\frac{31}{4}$
  • D
    $\frac{35}{4}$

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