Subtract the Rational Expressions $\frac { 3 a } { a - 9 } - \frac { 27 } { a - 9 }$

Multiple Choice

Subtract the rational expressions. Be sure to express your answer in simplest form. $\frac { 3 a } { a - 9 } - \frac { 27 } { a - 9 }$

A) 9
B) 3
C) $\frac { 3 a - 27 } { a + 9 }$
D) $\frac { 3 a + 27 } { a - 9 }$