A missile is fired over horizontal ground at an angle of 8.50°. At what point on the trajectory are [(v)\vec] and [(a)\vec] parallel to each other?

Question

At the end of the trajectory.
At the beginning of the trajectory.
At the top of the trajectory.
There is no point where v and a are parallel to each other.

Answer 1

since all the acceleration is due to gravity, which is just downward,
pick D