A student needs to make a circular cardboard piece with an area between 154 square inches and 616 square inches. The function f (r) relates the area of the cardboard piece, in square inches, to the radius r in inches. Which of the following shows a reasonable domain for f (r) ?
A) 7 < r < 14
B) 154 < r < 616
C) all positive integers less than 7
D) all positive integers between 14 and 154
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