Add the Rational Expressions $$\frac { x - 4 } { 6 } + \frac { x + 8 } { 7 }$$

Multiple Choice

Add the rational expressions. Be sure to express your answer in simplest form. $$\frac { x - 4 } { 6 } + \frac { x + 8 } { 7 }$$

A) $\frac { 36 } { 13 x + 20 }$
B) $\frac { 13 x - 76 } { 42 }$
C) $\frac { 13 x + 20 } { 42 }$
D) $\frac { 13 x - 20 } { 42 }$
E) $\frac { 2 x + 20 } { 13 }$