Answer:
Option C.
Explanation:
Two trapezoids W'X'Y'Z' and WXYZ have been given in the figure attached.
Trapezoid WXYZ has been dilated to form another trapezoid W'X'Y'Z'.
We have to find the scale factor by which WXYZ was dilated.
Dilation factor =

=

=

Therefore,
is the dilation factor by which trapezoid WXYZ was dilated.
Option C is the answer.