Find a Polar Equation in R And $\theta$ That Has the Same Graph as the Equation in X

Find a polar equation in r and $\theta$ that has the same graph as the equation in x and y. $3 y = - x$

A) $\theta = \cot ^ { - 1 } \left( - \frac { 1 } { 3 } \right)$
B) $r = \frac { 3 } { \sin \theta }$
C) $r = \frac { 3 } { \cos \theta }$
D) $\theta = \tan 3$
E) $\theta = \tan ^ { - 1 } \left( - \frac { 1 } { 3 } \right)$