Answer:
Segment DH is the answer.
Explanation:
Segment XY is dilated through point M with a scale factor of 2.
We have to find the correct line formed after dilation of XY about point M.
In ΔMXY and ΔMDH

Means DH = 2×(XY)
Which clearly shows that segment XY has been dilated by a scale factor of 2,while ratio with other segments is different from the scale factor of dilation.
Therefore DH is the segment dilated by a scale factor of 2.