Question

identifying a reflection
which transformation shows a reflection of △def?

Explanation:

Step1: Recall reflection properties

In a reflection, the pre - image and image are congruent, and corresponding points are equidistant from the line of reflection. Also, the orientation of the figure changes (it is flipped).

Step2: Analyze each option

Examine the relative positions of points D, E, F and D', E', F' in each transformation. In a correct reflection, if we consider a line of reflection, the distances from D to the line should be the same as from D' to the line, and so on for E and E', F and F'.

Answer:

The option where the triangle △D'E'F' is a mirror - image of △DEF (where corresponding sides and angles are congruent and the orientation is flipped) is the correct transformation showing a reflection. Without specific labels for the correct option among the given ones, we can't give a lettered answer, but the correct one is the one that meets the above - mentioned reflection criteria.