If V is the speed of a locomotive in km per hour, g is the acceleration due to gravity, G is the distance between running faces of the rails and R is the radius of the circular curve, the required super elevation is

• A. <img src="/_files/images/civil-engineering/surveying/63-3.194-1.png">
• B. <img src="/_files/images/civil-engineering/surveying/63-3.194-2.png">
• C. <img src="/_files/images/civil-engineering/surveying/63-3.194-3.png">
• D. <img src="/_files/images/civil-engineering/surveying/63-3.194-4.png">