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