Suppose x is any positive number. Circle 1: center (−7, 4) and radius 8x Circle 2: center (−7, 4) and radius 2x Why is circle 1 similar to circle 2? A: Circle 1 and circle 2 have the same diameter. B: Circle 1 is a dilation of circle 2 with a scale factor of 4. C: Circle 1 is congruent to circle 2. D: Circle 1 is a dilation of circle 2 with a scale factor of 0.25.