In the diagram, \triangle{PQR} is right-angled. Point S lies on PR so that \triangle{QRS} is equilateral and \triangle{PQS} is isosceles with PS=QS. The measure of \angle{QPR} is

**Answer Choices**

A. 35^\circ

B. 37.5^\circ

C. 25^\circ

D. 32.5^\circ

E. 30^\circ