D. 23 cm
Explanation
Diameter is a straight line passing from side to side through the centre of the circle and a radius is a straight line from the centre to the circumference of a circle
the relation between the diameter and the radius of a circle is given by:
[tex]radius=\frac{diameter}{2}[/tex](or the diameter is twice the radius)
then
a) let
[tex]diameter\text{= 46 cm}[/tex]now, replace
[tex]radius=\frac{46cm}{2}=23\text{ cm}[/tex]therefore, the answer is
D. 23 cm
I hope this helps you
