To find a dilation of 1/2 the trapezoid needs to be inside the larger trapezoid.
We can eliminate option B since the smaller trapezoid isn't in the larger trapezoid.
We can also eliminate option A because the larger trapezoid doesn't look like the smaller trapezoid.
Option D isn't correct because the y-coordinates are different.
Option C is correct because the y-coordinates are the same.
In option C:
The vertices of the larger triangle are (-8, 1) and (8, 1)
The vertices of the smaller triangle are (-4, 0) and (4, 0)
8/16 = 1/2
Best of Luck!