Answer: A. Two straights in horizontal plane only
A circular curve is most suited for connecting two straights in horizontal plane only.
Most commonly circular curves are used to connect intersecting tangent (Straight) sections of highways or railroads.
P.C = Point of curvature (Beginning of curve)
P.T = Point of tangency (End of curves)
When we provide a circular curve of different radii to connect two straight lines then it is called compound curve. Hence, a circular curve is most suited for connecting two straights in horizontal plane only.
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