A Projectile Starts at the Coordinate Origin, Where the Displacement $\theta$

A projectile starts at the coordinate origin, where the displacement vector also originates. The initial velocity, v0, makes an angle $\theta$ 0 with the horizontal where 0 < $\theta$ 0 < 90 $\degree$ . At the instant when the projectile is at the highest point of its trajectory, the displacement, velocity and acceleration vectors are $\overrightarrow{\mathbf{r}}$ , $\overrightarrow{\mathbf{v}}$ and $\overrightarrow{\mathbf{a}}$ . Which statement is true?

A) $\overrightarrow{\mathbf{r}}$ is parallel to $\overrightarrow{\mathbf{v}}$ .
B) $\overrightarrow{\mathbf{r}}$ is perpendicular to $\overrightarrow{\mathbf{v}}$ .
C) $\overrightarrow{\mathbf{v}}$ is parallel to $\overrightarrow{\mathbf{a}}$ .
D) $\overrightarrow{\mathbf{v}}$ is perpendicular to $\overrightarrow{\mathbf{a}}$ .
E) $\overrightarrow{\mathbf{r}}$ is perpendicular to $\overrightarrow{\mathbf{a}}$ .