Find the Magnitude and Direction Angle (To the Nearest Tenth) $\langle - 8,0 \rangle$

Multiple Choice

Find the magnitude and direction angle (to the nearest tenth) for each vector. Give the measure of the direction angle as an angle in [0,360°].
- $\langle - 8,0 \rangle$

A) $8 ; 180 ^ { \circ }$
B) $8 ; 270 ^ { \circ }$
C) $64 ; 180 ^ { \circ }$
D) $8 ; 90 ^ { \circ }$