The sequence of the given transformation is; B: rotation, then translation, then reflection
What is sequence of transformation?
We are told that they want to map ABC onto A"B"C" such that both triangles are congruent by the SSS congruence theorem.
Now, the first step will be to rotate triangle ABC so that it stands in a way that it can now be translated some units forward to match A'B'C'.
Finally, it is now reflected like mirrored to exactly map A'B'C'
Read more about sequence of transformation at; https://brainly.com/question/4289712