Given,
The diagram of the circle is,
Required
The radius of the circle O.
The radius of the circle is the line segment that join the center of the circle to any point on the circle.
In the circle, AO, FO, EO, CO and DO joins the center of the circle to the point on the circle. Hence AO, FO, EO, CO and DO are radius.
So, option D( All of the listed choice ) is correct.