Question

which transformation shows a reflection of △def?

Explanation:

Step1: Recall reflection properties

In a reflection, corresponding points of the original figure and its image are equidistant from the line of reflection, and the orientation of the figure changes (left - right or up - down reversed).

Step2: Analyze each option

Check each triangle transformation to see if the distances from points of $\triangle DEF$ to the line of reflection (implied) are the same as the distances of the corresponding points of $\triangle D'E'F'$ to the line of reflection, and if the orientation is reversed.

Answer:

(Without seeing the actual options clearly, cannot provide a specific choice. But the correct option will be the one where the points of $\triangle D'E'F'$ are equidistant from the line of reflection as the points of $\triangle DEF$ and the orientation is reversed.)