Answer:
A
Step-by-step explanation:
Once the stone is thrown, with direction vectors and initial velocity will keep on traveling for infinite period unless there is another force to stop it.
For example, Newton's 1st law of Motion: ''Every inanimate body will continue its state of rest/motion unless acted upon by an external unbalanced force''
Since there is no friction, drag or any viscous force, our stone will travel for infinite period of time.
I hope this helps :)