A. $\mathrm{NO}_{3}{ }^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{HCOO}^{-}, \mathrm{CH}_{3} \mathrm{COO}^{-}$
B. $\mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{HCOO}^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{NO}_{3}{ }^{-}$
C. $\mathrm{NO}_{3}{ }^{-}, \mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{HCOO}^{-}, \mathrm{NO}_{2}{ }^{-}$
D. CH3COO−,NO3−,NO2−,HCOO−\mathrm{CH}_{3} \mathrm{COO}^{-}, \mathrm{NO}_{3}{ }^{-}, \mathrm{NO}_{2}{ }^{-}, \mathrm{HCOO}^{-}CH3COO−,NO3−,NO2−,HCOO−
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