The correct answer is A. Banihal.
Banihal railway station is the highest railway station in Jammu and Kashmir, India. It is located at an elevation of 2,750 meters (9,060 feet) above sea level. The station is on the Banihal-Qazigund railway line, which connects Jammu with Srinagar. The line was opened in 2002 and is the highest railway line in India.
The other options are incorrect because they are not the highest railway stations in Jammu. Jammu Tawi railway station is located at an elevation of 300 meters (980 feet), Katra railway station is located at an elevation of 1,200 meters (3,900 feet), and Udhampur railway station is located at an elevation of 2,100 meters (6,900 feet).
Banihal railway station is a major railway station in Jammu and Kashmir. It is a junction station for the Banihal-Qazigund railway line and the Jammu-Banihal railway line. The station is also a major tourist destination.