Which circle has a radius that measures 10 units?

A) Circle D is shown. A line segment goes from one point to another point on the circle and has a length of 10.
B) Circle F is shown. A line segment goes from one point to another point on the circle and goes through point F. It has a length of 20.
C) Circle G is shown. A line segment goes from one point to another point on the circle and goes through point G. It has a length of 10.
D) Circle H is shown. A line segment goes from one point to another point on the circle and has a length of 20.