The correct decreasing order of priority for functional groups of organic chemistry in the IUPAC nomenclature system is:

The correct option is B. > > >

As we have discussed in the videos, the correct order of priority for functional group of organic chemistry in IUPAC nomenclature is:

$\Rightarrow$ $-COOH$ > $-S{O}_{3}H$ > $-CO{O}^{-}{M}^{+}$ > $-COOR$ > $-COX$ > $-CON{H}_2$ > $-C\equiv N$ > $-CHO$ > $C=O$ > $-OH$ > $-SH$ > $-N{H}_2$ > $=NH$ > $-OR$ > $-SR$

Therefore,
From the given options, the correct order is

$-COOH$ > $-S{O}_{3}H$ > $-CON{H}_2$ > $-CHO$

Carboxylic acid > Sulphuric acid > Amide > Aldehyde