The figure which is drawn in option D shows a circle with a diameter.
What is the diameter of the circle?
The diameter of a circle is the distance from one point on the surface of a circle to the other point on the circle's surface, which passes through the center.
What is radius of circle?
Radius of a circle is the distance from the center of the circle to any point on it's circumference.
According to the given question
We have, some figures of a circle.
In option A there is no any diameter and radius is drawn for the given circle.
In option B, the given line which is drawn in the circle is the radius of the circle not a diameter. Because " radius of a circle is the distance from the center of the circle to any point on it's circumference.
In option C, there is no any diameter and radius is drawn is the given figure or circle.
In option D, the given line which is drawn in the circle is the diameter of the circle because the distance from one point on the surface of a circle to the other point on the circle's surface, which passes through the center is called diameter.
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