Answer:
C. BE:KA
Explanation:
The segments that have a ratio of lengths 1:2 are BE and KA.
A diameter is a straight line that touches 2 points on the circumference of a circle and touches the point at the center. KA is the diameter.
A radius is a straight line touches a point on the circumference of a circle and touches the point at the center. BE is the radius.
The radius of a circle is half the diameter.
If the radius is 1 cm, then the diameter is 2 cm.