Find the Term Indicated in the Expansion $( x + 3 y ) ^ { 9 } ;$

Multiple Choice

Find the term indicated in the expansion.
- $( x + 3 y ) ^ { 9 } ;$ 4th term

A) $2268 x ^ { 6 } y ^ { 3 }$
B) $756 x ^ { 6 } y ^ { 4 }$
C) $756 x ^ { 3 } y ^ { 6 }$
D) $2268 x ^ { 3 } y ^ { 6 }$