The best description of displacement is:
"Displacement is a vector quality showing total length of an area traveled by a particular object."
However, it is important to note that displacement specifically refers to the change in position of an object, which is defined as the straight line distance from the initial position to the final position, along with a direction. Therefore, the description should clarify that displacement is a vector quantity that has both magnitude and direction, rather than just the "total length of an area traveled."
The first response incorrectly states that displacement is scalar, and the second one describes distance instead of displacement.