Correct option is B
The
Point of Curvature (PC) is the point where the alignment changes from a straight line (or tangent) to a circular curve. This is a critical point in road and railway design where the straight alignment transitions into the curved path.
Point of commencement: Incorrect, this term generally refers to the start of a project or construction work.
Point of curvature: Correct, as this is where the alignment changes from a tangent to a curve.
Point of tangency: This is the point where the curve ends and the alignment returns to a straight tangent.
Finishing mark: Not a standard term used in this context.
Therefore, the correct answer is (b) Point of curvature.
