The best description of displacement among the given responses is:
Displacement is a vector quality showing total length of an area traveled by a particular object.
However, this statement is somewhat misleading. While displacement indeed is a vector quantity that specifies the change in position of an object from its starting point to its final position, it does not account for the total length of the path traveled. Instead, it focuses solely on the direct line distance and direction from the initial to the final position. Given that context, none of the options perfectly captures the definition of displacement, but the last option identifies it as a vector quantity, which is correct in terms of displacement being a vector.