Option (a) is correct.
radius of circle whose circumference is inches is 6 inches.
Step-by-step explanation:
Given : circumference of a circle is inches
We have to find the radius of circle whose circumference is inches.
Circumference is the  distance of the outer  path of the circle.
Circumference of circle is given as Â
We know circumference = inches
Substitute, we get,
inches
Solving for r,
Divide both sides by , we get,
inches
Divide both side by 2, we get,
r = 6 inches
Thus, radius of circle whose circumference is inches is 6 inches.
Option (a) is correct.