The correct answer is option 2, Haryana. Haryana has planned to host the Khelo India Youth Games (4th Edition). The Khelo India Youth Games is a multidisciplinary grassroots event that provides a platform for young athletes to showcase their talent in various sports. The event is organized by the Ministry of Youth Affairs and Sports, Government of India.

Option 1, Kerala, is not the correct answer. Kerala is not the planned host for the Khelo India Youth Games (4th Edition).

Option 3, Gujarat, is also not the correct answer. Gujarat is not the planned host for the Khelo India Youth Games (4th Edition).

Option 4, Manipur, is not the correct answer. Manipur is not the planned host for the Khelo India Youth Games (4th Edition).

In summary, Haryana is the state that has planned to host the Khelo India Youth Games (4th Edition).