Introduction:
Vijay Prahar is a military exercise conducted by the Indian Army. It is designed to validate the Army's capabilities in a simulated war scenario. The exercise focuses on enhancing operational preparedness and coordination between various arms and services of the Indian Army.

Explanation:
The correct answer is option B, Rajasthan. Vijay Prahar is conducted in the state of Rajasthan. Let's discuss why Rajasthan is the correct answer:

1. Location: Rajasthan is strategically located in the western region of India. It shares its borders with Pakistan and is known for its vast desert terrain. This makes it an ideal location for conducting military exercises.

2. Training Facilities: Rajasthan offers excellent training facilities for the military. The state has vast open spaces, deserts, and diverse terrains that provide realistic training scenarios for the Army. It allows the soldiers to practice their skills in a variety of environments.

3. Joint Training: Vijay Prahar focuses on joint training and coordination between different arms and services of the Indian Army. Rajasthan provides ample opportunities for joint training exercises involving infantry, armored units, artillery, and air support.

4. Realistic Scenario: The desert terrain of Rajasthan replicates certain aspects of the actual war scenario, especially in the context of the western border with Pakistan. The exercise allows the Army to practice and refine its strategies and tactics in a realistic environment.

5. Logistical Support: Rajasthan offers good logistical support for conducting large-scale military exercises. It has well-connected road and rail networks, which facilitate the transportation of troops, equipment, and supplies to and from the exercise area.

6. Experience: Rajasthan has a history of hosting various military exercises and maneuvers. The state has been a preferred choice for the Indian Army due to its suitability for conducting such exercises.

In conclusion, Vijay Prahar is conducted in Rajasthan due to its strategic location, training facilities, realistic terrain, joint training opportunities, logistical support, and previous experience of hosting military exercises.