Explanation:

- Option 1: Karl Marx

- Marx was a philosopher and economist known for his critiques of capitalism.

- He focused on concepts like class struggle and the "dictatorship of the proletariat," not Industrial Democracy.

- Option 2: Sidney and Beatrice Webbs

- The Webbs were influential sociologists and economists.

- They coined the term "Industrial Democracy."

- Their work focused on worker participation in management.

- Option 3: Peter F. Drucker

- Drucker was a management consultant who did significant work on modern business management.

- He did not coin the term Industrial Democracy.

- Option 4: John Dunlop

- Dunlop was well-known for his work in labor economics and industrial relations, but not for coining Industrial Democracy.