The Surface of the Exit Road Is Horizontal,not Banked

Multiple Choice

The surface of the exit road is horizontal,not banked.(See figure.) If the radius of curvature of a highway exit is 82.5 m and the maximum speed with which the car can exit the highway safely without sliding is 25.2 m/s,what is the coefficient of static friction between the tires and the surface of the road?

A) 0.69
B) 0.85
C) 0.78
D) 0.56
E) 0.72