The center of dilation that makes sense is (7,4) because the scale factor for the dilation shown is 3. If the center of dilation is (0,0), then the dilation factor won't make sense.
We can try dilating point U with center of dilation at (7,4), so point U with respecto the center of dilation, it's placed three units to the right, and using the dilation factor would be 9 spots right becase 3*3 = 9, which actually happens.
Hence, the answer is the second option.
