When Three Vectors $\overrightarrow { \mathrm { A } }$ $\vec { B }$

When three vectors, $\overrightarrow { \mathrm { A } }$ , $\vec { B }$ ,and $\overrightarrow { \mathrm { C } }$ are placed head to tail,the vector sum $\overrightarrow { \mathbf { A } } + \overrightarrow { \mathbf { B } } + \overrightarrow { \mathbf { C } } = 0$ .If the vectors all have the same magnitude,the angle between the directions of any two adjacent vectors is

A) 30 $\degree$
B) 60 $\degree$
C) 90 $\degree$
D) 120 $\degree$
E) 150 $\degree$