Simplify by Rationalizing the Denominator $\frac { 6 - 3 i } { 5 + 7 i }$

Simplify by rationalizing the denominator. Write your answer in a +bi form.
- $\frac { 6 - 3 i } { 5 + 7 i }$

A) $- \frac { 17 } { 8 } - \frac { 19 } { 8 } \mathrm { i }$
B) $\frac { 9 } { 74 } - \frac { 57 } { 74 } \mathrm { i }$
C) $\frac { 51 } { 74 } - \frac { 27 } { 74 } \mathrm { i }$
D) $- \frac { 3 } { 8 } - \frac { 19 } { 8 } \mathrm { i }$