In atomic absorption quantitative analysis, one of the basic conditions for replacing the integral absorption with peak absorption is ()

A．The half width of the emission line of the radiation source is much narrower than the half width of the absorption line
B．The half width of the emission line of the radiation source should be almost equal to the half width of the absorption line
C．The half width of the absorption line is much narrower than the half width of the emission line
D．The monochromator must have very high resolution