13. Let $P = ( - 1,0 ) Q = ( 0,0 ) R = ( 3,3 \sqrt { } 3 )$ be three points. Then the equation of the bisector of the bisector of the angle PQR is\\
(A) $\sqrt { } 3 / 2 x + y = 0$\\
(B) $x + \sqrt { } 3 y = 0$\\
(C) $\sqrt { } 3 x + y = 0$\\
(D) $x + \sqrt { } 3 / 2 y = 0$\\