Solve the Problem $\mathrm { r }$ -Value for the Polar Equation

Multiple Choice

Solve the problem.
-What is the maximum $\mathrm { r }$ -value for the polar equation $r = - 1 + 6 \sin \theta$ ? Note that a maximum $r$ -value is a maximum value of $| \mathrm { r } |$ , the maximum distance from the pole.

A) 5
B) 6
C) 7
D) 1