The correct option is B Radius-OA,OC,OB ; Chord-BC ; Diameter AB ; Centre-O
The radius of a circle is the distance from the center of a circle to any point on the circle. If you place two radii end-to-end in a circle, you would have the same length as one diameter.
A chord of a circle is a straight line segment whose endpoints both lie on the circle.
From the above figure we can find that
Radius-OA,OC,OB ; Chord-BC ; Diameter AB ; Centre-O