If V is speed in km/hour and R is radius of the curve, the superelevation e is equal to

• A. <img src="/_files/images/civil-engineering/highway-engineering/48-16-317-1.png">
• B. <img src="/_files/images/civil-engineering/highway-engineering/48-16-317-2.png">
• C. <img src="/_files/images/civil-engineering/highway-engineering/48-16-317-3.png">
• D. <img src="/_files/images/civil-engineering/highway-engineering/48-16-317-4.png">