A Point in Rectangular Coordinates Is Given $( - \sqrt { 19 } , \sqrt { 19 } )$

Multiple Choice

A point in rectangular coordinates is given.Convert the point to polar coordinates, r > 0. $( - \sqrt { 19 } , \sqrt { 19 } )$

A) Polar coordinates: $\left( \sqrt { 38 } , \frac { 3 \pi } { 4 } \right)$
B) Polar coordinates: $\left( \sqrt { 38 } , - \frac { \pi } { 4 } \right)$
C) Polar coordinates: $\left( \sqrt { 38 } , - \frac { 3 \pi } { 4 } \right)$
D) Polar coordinates: $\left( \sqrt { 38 } , \frac { \pi } { 4 } \right)$
E) Polar coordinates: $\left( \sqrt { 38 } , \frac { 5 \pi } { 4 } \right)$