Find a Polar Equation in R and 0 of the Parabola

Multiple Choice

Find a polar equation in r and 0 of the parabola with focus at the pole and the given vertex. $V \left( 9 , \frac { \pi } { 2 } \right)$

A) $r = \frac { 18 } { 1 - \cos \theta }$
B) $r = \frac { 18 } { 1 + \sin \theta }$
C) $r = \frac { 9 } { 1 + 9 \sin \theta }$
D) $r = \frac { 9 } { 1 + \cos \theta }$
E) $r = \frac { 16 } { 1 - \sin \theta }$