i searched for this myself but when i drew what they were asking it was pretty obvious that the answer was a diameter. hope this will help.
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The circumference of a circle represents its perimeter and the distance around it.
The circumference is the distance around a circle.
The distance around a circle is its circumference.
circumference
The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.