SAT Lines, angles, and triangles Question

Quadrilateral MNOP is similar to quadrilateral QRST such that M,N,0,and P correspond to Q,R,S,and T,respectively.The length of each side of quadrilateral MNOP is 2 times the length of its corresponding side in quadrilateral QRST.The measure of angle P is $50^{\circ }$ and $\mathrm{ST}=8$ .Which of the following must be true?