Erin was able to map line segment AB¯¯¯¯¯¯¯¯ onto line segment CB¯¯¯¯¯¯¯¯ using a rotation and a dilation. Erin concluded: "I was able to map line segment AB¯¯¯¯¯¯¯¯ onto line segment CB¯¯¯¯¯¯¯¯ using a sequence of rigid transformations and dilations, so the figures are similar."

Erin used a dilation, so the segments aren't similar.

The segments are congruent, not similar.

There is no error. This is a correct conclusion.