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Answer:
translate <-6, 0>, reflect over x
Explanation:
Point D is at the top in the pre-image and at the bottom in the image, so a vertical reflection is indicated. Only the 1st and 3rd choices show a reflection over the x-axis.
The image is to the left of the pre-image by 6 units, so the translation is in the negative direction. Only the 3rd choice has that.