Which one of the following is most soluble?

  • A
    $CuS$ $(K_{sp} = 8 \times 10^{-37})$
  • B
    $MnS$ $(K_{sp} = 7 \times 10^{-16})$
  • C
    $Bi_2S_3$ $(K_{sp} = 1 \times 10^{-70})$
  • D
    $Ag_2S$ $(K_{sp} = 6 \times 10^{-51})$

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