Find the Quotient and Check $\left( 12 a ^ { 2 } + 18 a - 12 \right) \div ( 3 a + 6 )$

Multiple Choice

Find the quotient and check. $\left( 12 a ^ { 2 } + 18 a - 12 \right) \div ( 3 a + 6 )$

A) $4 a + 7$
B) $4 a - 5$
C) $4 a + 2$
D) $4 a - 2$
E) $4 a + 8$