Which type of vectors have their lines of action meeting at one point?

Concurrent vectors are defined as vectors whose lines of action intersect or meet at a single point. This characteristic is crucial for various applications in engineering and physics, particularly when analyzing forces and their resulting effect on a system. When dealing with concurrent vectors, it becomes easier to determine the resultant force and direction since all the forces act from or converge at a common point.

In contrast, co-planar vectors lie in the same plane but may not necessarily intersect at a single point, making them suitable for different types of analysis. Parallel vectors, as the name suggests, run alongside one another and do not meet or intersect at any point. Orthogonal vectors are specifically at right angles to each other, which also means they do not converge at a single point but instead maintain a perpendicular relationship. The unique property of concurrent vectors that allows for their lines of action to meet at one point is the reason they are the correct choice for this question.