which of the following names a ray in the drawing

The name which represents a ray in the drawing is:
[tex]\underset{CB}{\rightarrow}[/tex]
Ray--
A ray is a line that originates from a point and it goes to infinity from the other direction.
i.e. it has just one end point and the other end is represented by a arrow which represents that it goes to infinity from the other side.
i.e. one of the end is fixed and the other is not.
Now, with the choices provided to us the one which represents a ray is:
[tex]\underset{CB}{\rightarrow}[/tex]
Since, it originates from the points C and extends in the other direction beyond B.