FERMAT 2019 Problem 6

In the diagram, P Q R S is a rectangle. Also, \triangle S T U, \triangle U V W and \triangle W X R are congruent.
fermat 2019 6
What fraction of the area of rectangle P Q R S is shaded?

Answer Choices
A. \frac{3}{7}
B. \frac{3}{4}
C. \frac{1}{2}
D. \frac{3}{5}
E. \frac{2}{3}