Write the Expression in Lowest Terms $\frac { 9 y + 9 a } { y ^ { 2 } + y a }$

Write the expression in lowest terms. If the expression is already in lowest terms, so indicate. Assume that the denominator does not equal zero. $\frac { 9 y + 9 a } { y ^ { 2 } + y a }$

A) $\frac { 9 } { a }$
B) $\frac { 9 } { y + a }$
C) $\frac { 9 } { y }$
D) $\frac { 9 y } { a }$
E) in lowest terms