Find the Modulus and the Argument for the Complex Number $z = - 15$

Multiple Choice

Find the modulus and the argument for the complex number. $z = - 15$

A) $r = - 15 , \theta = \pi / 2$
B) $r = 15 , \theta = \pi$
C) $r = 15 i , \theta = 0$
D) $r= 15 ^ { 2 } , \theta = \pi$
E) $r = 1 , \theta = 3 \pi / 2$