[" 5The solubility of "[Co(NH_(3))_(4)Cl_(2)]ClO_(4)],[70," and the measured resistance was "33.5Omega" in a cell with cell constant of "],[0.20" is "],[[" (A) "59.7mmol/L," (B) "49.7mmol/L," (C) "39.7mmol/L," (D) "29.7mmol/L]]