The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is
A. `-CONH_(2),-CHO,-SO_(3)H,-COOH`
B. `-COOH,-SO_(3)H,-CONH_(2),-CHO`
C. `-SO_(3)H,-COOH,-CONH_(2),-CHO`
D. `-CHO,-COOH,-SO_(3)H,-CONH_(2)`