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To find the scale factor from triangle ABC to triangle DEF, you can divide each side length by its corresponding side on the other triangle.
72 ÷ 12 = 6
42 ÷ 7 = 6
66 ÷ 11 = 6
Now, the options are narrowed down to either B or C. Since the dilation shown reduces the size of triangle ABC to triangle DEF, it is a reduction. Therefore, the scale factor must be a fraction, leaving the only correct answer to be choice B.
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