Explanation:

- Correct Answer: Option 2: Vairengte

- The Counter Insurgency and Jungle Warfare School (CIJWS) is located in Vairengte, Mizoram. It is one of the world's premier military training institutions, known for training soldiers in counter-insurgency, guerrilla warfare, and jungle warfare.

- Option 1: Dehradun

- Dehradun is home to the Indian Military Academy (IMA), which trains officers for the Indian Army. It is not associated with counter-insurgency or jungle warfare training specifically.

- Option 3: Gulmarg

- Gulmarg houses the High Altitude Warfare School (HAWS), which specializes in training for operations in high-altitude, mountainous, and snow conditions.

- Option 4: Mhow

- Mhow hosts several military institutions, including the Infantry School and the Army War College, which are not specifically focused on counter-insurgency or jungle warfare.