The maximum speed with which a vehicle can negotiate a curved road, which is banked at an angle θ = tan^{-1} (0.24), is 54 km/hr. If the same road is flat and vehicle has to negotiate the curve with same maximum speed, the coefficient of friction between the road and tyres of the vehicle should be

(A) 0.35

(B) 0.24

(C) 0.8

(D) 0.5