The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system is:

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IUPAC Priority Series
According to IUPAC, the priority of functional groups for suffix naming is:
Carboxylic acid  Sulphonic acid  Esters  Acid Halides  Amides  Nitriles  Aldehydes  Ketones  Alcohols  Amines.

- Sulphonic acid ()  Acid Chloride ()  Amide ()  Cyanide ().
This perfectly follows the established priority order.

Step 3: Conclusion
Option (b) is the correct decreasing order.

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