If $\overrightarrow { \mathbf { A } } \cdot \overrightarrow { \mathbf { C } } = - 7.5$

Multiple Choice

If $\overrightarrow { \mathbf { A } } \cdot \overrightarrow { \mathbf { C } } = - 7.5$ , $\overrightarrow { \mathbf { A } } = 3 \hat { \mathbf { i } } - 4 \hat { \mathbf { j } }$ ,and $| \overrightarrow { \mathbf { c } } | = 6.5$ ,what is the angle between the two vectors when they are drawn starting from the same point?

A) 118 $\degree$
B) 107 $\degree$
C) 112 $\degree$
D) 103 $\degree$
E) 77 $\degree$