If the maximum allowable speed of a vehicle is 20 m/s and can accelerate at 0.25 m/s2, then what must be the radius of the circular curve and length of transition curve such that ratio of centrifugal force on vehicle to its weight is 1 ∶ 4?(Take g = 10 m/s2)

• A. 250 m, 320 m
• B. 250 m, 160 m
• C. 160 m, 500 m
• D. 160 m, 200 m