The correct option is D Change in position
Area of v−t graph = Displacement of the particle
We already know, Displacement = Change in position of the particle
Hence, area of v−t graph gives change in position. Hence (d) is correct.
|Area under the v−t graph|=Distance
Hence, we can obtain distance covered by the particle from v−t graph.
∴ option (c) is correct
We can read velocity data on the v - axis. So we can get change in speed and velocity.
Hence (a) and (b) are also correct.