I believe the answer is A. I'm not too sure though. How did I come to this conclusion? ¯\_(ツ)_/¯
The displacement vector is a vector which gives the point's current position with reference to other points apart from points from the origin. The given length here of the minute hand is the radius and the distance can be written as,
r∠θ
which means that the position can be described by the θ.