The best response to the comparison of dilation transformations to translations, rotations, and reflections is:
Dilation transformations are the only ones that do not maintain the same side lengths.
This is because dilations change the size of figures, whereas translations, rotations, and reflections preserve the size and shape of the figures. Translations move figures without changing their dimensions, rotations turn figures around a point without altering their size, and reflections flip figures over a line, also keeping size and shape unchanged. Dilation specifically alters the size, leading to changes in side lengths.