Area of v-t graph = $\underset{{\mathrm{t}}_{\mathrm{i}}}{\overset{{\mathrm{t}}_{\mathrm{f}}}{\int }}\mathrm{Vdt}=\underset{{\overrightarrow{\mathrm{r}}}_{\mathrm{i}}}{\overset{{\overrightarrow{\mathrm{r}}}_{\mathrm{f}}}{\int }}\mathrm{dr}={\overrightarrow{\mathrm{r}}}_{\mathrm{f}}-{\overrightarrow{\mathrm{r}}}_{\mathrm{i}}$
Hence area of v-t graph gives 
Change in position vector 
Hence D is correct
$\therefore$ |change in position| = |displacement| = distance
We can read data v on the v-axis. So we can get change in speed and velocity.
Hence A and B is correct