In triangle \bigtriangleup PQR, R = 70^{\circ} and \angle Q = 80^{\circ}. If point S is on line RQ such that PS bisects \angle P. Find angle \angle{PSR}.

Question

( A ) 90^{\circ}
( B ) 85^{\circ}
( C ) 70^{\circ}
( D ) 95^{\circ}