Perform the Indicated Division and Express Your Answer in Simplest $\frac { 12 s a } { 3 s ^ { 2 } - 3 s a } \div \frac { s a + a } { 2 s - 2 a }$

Perform the indicated division and express your answer in simplest form. $\frac { 12 s a } { 3 s ^ { 2 } - 3 s a } \div \frac { s a + a } { 2 s - 2 a }$

A) $\frac { 8 ( s + 1 ) } { ( s - a ) ^ { 2 } }$
B) $\frac { 8 } { s + 1 }$
C) $\frac { 5 + a } { 8 }$
D) $\frac { 8 } { s + a }$
E) $\frac { s + 1 } { 8 }$