Each of \Delta{PQR} and \Delta{STU} has an area of 1. In \Delta{PQR},U,W and V are the midpoints of the sides, as shown. In \Delta{STU},R,V and W are the midpoints of the sides. What is the area of parallelogram UVRW?
Answer Choices
A. 1
B. \frac12
C. \frac13
D. \frac14
E. \frac23