Answer:
C. Radius.
Explanation:
We have been given an incomplete sentence. We are supposed to complete our given statement.
Statement: A point is on a circle if the distance from the center of the circle to the point is equal to the_____
We know that the distance between a point on circle from center of the circle is known as radius of circle, therefore, the correct word for our given blank is radius and option C is the correct choice.