The correct answer is: A. East Central Railway
The headquarters of East Central Railway is located in Ranchi, Jharkhand. Ranchi is located at an elevation of 2,140 feet (652 meters) above sea level. This is the highest elevation of any of the railway zones in India.
The other options are incorrect because their headquarters are located at lower elevations. The headquarters of South Eastern Railway is located in Kolkata, West Bengal, which is at an elevation of 6 feet (1.8 meters) above sea level. The headquarters of South Western Railway is located in Hubli, Karnataka, which is at an elevation of 3,000 feet (914 meters) above sea level. The headquarters of West Central Railway is located in Jabalpur, Madhya Pradesh, which is at an elevation of 2,300 feet (701 meters) above sea level.