"It's not possible to map ABCD onto GFEH using a sequence of rigid transformations, so the quadrilaterals are not congruent." what error did Adam make in his conclusion?

A. One more transformation—a rotation— would map ABCD onto GFEH. So the quadrilateral are congruent.
B. One more transformation— a reflection— would map ABCD onto GFEH. So the quadrilaterals are congruent.
C. There is no error. This is a correct conclusion.