The area under the velocity-time graph gives:

1. The velocity-time graph is a depiction of the variation of the velocity of a body with time.
2. The slope of the velocity-time graph gives the acceleration.
3. The area of the velocity-time graph is basically the product of velocity and time.

4. We know that, velocity$\times$ time= displacement in the body.

5. Thus, it is obvious that the area under the velocity-time graph gives the displacement of a moving object.

Thus,

Option D) displacement is the correct option.