相对分子质量为M的气态化合物V L(已换算成标准状况)溶于m g水中，得到溶液的质量分数为ω%，物质的量浓度为c mol/L，密度为ρ g·cm－3，则下列说法正确的是( )
A．相对分子质量M可表示为： |
B．物质的量浓度C可表示为： |
C．溶液的质量分数ω%可表示为： |
D．溶液密度ρ可表示为： |
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