Explanation:

- The Salt Satyagraha was a part of the larger Indian independence movement against British rule, initiated by Mahatma Gandhi in 1930.

- Option 1: Rajasthan

- Rajasthan was not prominently associated with the Salt Satyagraha.

- The movement primarily focused on coastal regions where salt could be produced directly.

- Option 2: Maharashtra

- While there were significant national movements here, it wasn't the main focus for Rajagopalachari.

- Option 3: Gujarat

- The iconic Dandi March led by Gandhi took place here, but Rajagopalachari's efforts were elsewhere.

- Option 4: Tamil Nadu

- C Rajagopalachari led the Salt Satyagraha in the state of Tamil Nadu.

- He organized a salt march from Trichy to Vedaranyam, mirroring Gandhi's march.