Final answer:
The displacement of the projectile from the time it left the ground until it returned to the ground includes both horizontal and vertical components. The total displacement is the vector sum of the horizontal and vertical displacements.
Step-by-step explanation:
The displacement of the projectile from the time it left the ground until it returned to the ground includes both horizontal and vertical components. The horizontal displacement is the distance covered in the x-axis, and the vertical displacement is the change in height in the y-axis.
The total displacement is the vector sum of the horizontal and vertical displacements. It represents the straight-line distance and direction from the starting point to the ending point of the projectile's motion.
Therefore, the correct answer is c) Total displacement.