Answer: D) Midsegment Theorem for Trapezoids
Assuming that the bottom horizontal segment is 9 units long, this would mean that x = 5 on top, added to the 9 on the bottom, gives 5+9 = 14. This cuts in half to get 14/2 = 7, which is the length of the midsegment of the trapezoid.
In short: add the parallel sides of the trapezoid, then cut that result in half. This will yield the midsegment.
