Aly drew 4 circles, each with a different diameter, on a piece of paper. For each circle, she laid a piece of string along the outline, and then measured the length of the string. Her results are shown in the table below. Circle Measurements Diameter Length of String 2 in 6.25 in 4 in 12.5 in 6 in 18.75 in 8 in 25 in Which conclusion could Aly come to about the circumference of a circle using this data? A. C 2 × d B. C 4.25 + d C. C 3 × d D. C 3.5 × d