Answer-
The answer is correct.
Solution-
The length of the side WX of the figure WXYZ = 8 m
The length of the side W'X' of the dilated figure W'X'Y'Z' = 6 m
We know that

( If the absolute value of the scale factor is greater than 1, then the image will be larger than the pre-image and vice-versa. A negative scale factor causes the dilation to rotate 180 degrees )