Explanation:

- The Third Round Table Conference was held in the year 1932.

- This was the last of the three conferences organized by the British government to discuss constitutional reforms in India.

- Unlike the earlier two conferences, the participation in the third one was sparse, with few prominent Indian leaders attending.

- Option 1: 1932 - This is the year when the Third Round Table Conference took place.

- Option 2: 1928 - This was before any of the Round Table Conferences were held.

- Option 3: 1929 - This was also before the First Round Table Conference commenced in 1930.

- Option 4: 1930 - This was the year when the First Round Table Conference was held.