(A) area of a circle, the circumference of the circle
(B) area of a circle, length of its diameter
(C) circumference of a circle, length of its radius
(D) circumference of a circle, length of its diameter
(A) area of a circle, the circumference of the circle
(B) area of a circle, length of its diameter
(C) circumference of a circle, length of its radius
(D) circumference of a circle, length of its diameter