Find the Angle Between the Vectors $\mathbf { u }$ And $\mathbf { v }$

Multiple Choice

Find the angle between the vectors $\mathbf { u }$ and $\mathbf { v }$ .
$$\mathbf { u } = \cos \left( \frac { \pi } { 3 } \right) \mathbf { i } + \sin \left( \frac { \pi } { 3 } \right) \mathbf { j } , \mathbf { v } = \cos \left( \frac { 5 \pi } { 4 } \right) \mathbf { i } + \sin \left( \frac { 5 \pi } { 4 } \right) \mathbf { j }$$

A) $40 ^ { \circ }$

B) $75 ^ { \circ }$

C) $105 ^ { \circ }$

D) $165 ^ { \circ }$

E) $175 ^ { \circ }$