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【单选题】
Ag某溶液，密度为ρ g/cm 3 ，保持温度不变加入bg溶质或蒸发ag水都能使原溶液变为饱和溶液，若已知溶质的摩尔质量为Mg/mol，则原溶液中溶质的物质的量浓度为（ ）A.
1000ρ(A-a)b /AM(a+b)
B.
1000ρb (A-a )/AaM
C.
1000ρb /M(a+b)
D.
b ρ (A-a)/AM(a+b)
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