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Math·Geometry and Trigonometry·Lines, angles, and triangles

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In triangle PQR, $\overline{QR}$ is extended to point S. The measure of $\angle PQR$ is $142^{\circ }$ and the measure of $\angle PRS$ is $166^{\circ }$. What is the measure of $\angle QPR$?

A

$24^{\circ }$

B

$14^{\circ }$

C

$19^{\circ }$

D

$8^{\circ }$