A train is moving towards north. At one place it turns towards north-east, here we observe that [AIIMS 1980]

• A. The radius of curvature of outer rail will be greater than that of the inner rail
• B. The radius of the inner rail will be greater than that of the outer rail
• C. The radius of curvature of one of the rails will be greater
• D. The radius of curvature of the outer and inner rails will be the same