In the similaritytransformation of AACBto ADFE, AACB was dilated bya scale factor of 1/3, reflected3 across the [? ], and movedthrough the translation [ ].

ANSWER
A. x-axis
EXPLANATION
The reflection of triangle ACB after the dilation by a factor of 1/3 must be a reflection across the x-axis,
This way, the new triangle is congruent to triangle DFE but translated to other coordinates.