GAUSS7 2014 Problem 17

Past Contests GAUSS7 GAUSS (GR. 7) - 2014
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1

In the diagram shown, PQR is a straight line segment. The measure of \angle{QSR} is

Image

Answer Choices
A. 25^\circ
B. 30^\circ
C. 35^\circ
D. 40^\circ
E. 45^\circ