Answer:
The last graph shows a line.
Explanation:
In order, from top to bottom, you have an Angle, a Point, a Ray, and a Line.
The Ray (the one you have marked as the answer) is NOT correct because is has an endpoint and continues in only one direction.
The last image IS correct, it is a Line as it goes on forever in both directions. Honestly, they should have put arrows at each end.
Hope this helps!