The formula for the area, A, of a circle is A = πr2, where r is the circle's radius, and the formula for the circumference, C, of a circle is C = πd, where d is the circle's diameter. Which statement is correct?
A) A circle's radius and area are in a proportional relationship, and so are its diameter and circumference.
B) A circle's radius and area are not in a proportional relationship, but its diameter and circumference are.
C) A circle's radius and area are in a proportional relationship, but its diameter and circumference are not.
D) A circle's radius and area are not in a proportional relationship, and neither are its diameter and circumference.
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