A triangle with vertices at A(0, 0), B(0, 4), and C(6, 0) is dilated to yield a triangle with vertices at A(0, 0), B(0, 10), and C(15, 0). The origin is the center of dilation. What is the scale factor of the dilation? A. 1.5. B. 2. C. 2.5. D. 3