Which term refers to the change in the position of a body relative to a reference point?

The term that refers to the change in the position of a body relative to a reference point is displacement. Displacement is a vector quantity that indicates not only how far an object has moved from its original position, but also the direction of that movement. It is defined as the shortest straight-line distance from the starting point to the final position and includes the direction of movement.

Magnitude refers to the size or amount of a quantity and does not specifically convey information about position changes. Direction describes the orientation of movement or change but does not quantify the movement itself. Distance, while a measure of how much ground an object has covered during its motion, does not take into account the direction, which is crucial for determining the change in position relative to a reference point.