Answer : 4. "24 मई, 2017,झालावाड़"
Explanation :

1. Chief Minister Vasundhara Raje launched the 'Grow Cotton - Get Happiness' campaign of the Shri Vallabh Pitti Group at Dhanodi in the Jhalawar district.

2. This campaign will give good income to the farmers from their cotton cultivation and will help them become financially strong.

3. Due to this campaign, the area under cotton cultivation in Rajasthan has increased significantly.