GAUSS8 2008 Problem 13

Past Contests GAUSS8 GAUSS (GR. 8) - 2008
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1

In the diagram, RSP is a straight line and \angle{QSP}=80^\circ. The measure of \angle{PQR} is

Image

Answer Choices
A. 120^\circ
B. 90^\circ
C. 80^\circ
D. 60^\circ
E. 75^\circ