Factor by Grouping $$s ^ { 2 } + 4 s + 9 s + 36$$

Multiple Choice

Factor by grouping.
- $$s ^ { 2 } + 4 s + 9 s + 36$$

A) $( \mathrm { s } + 4 ) ( \mathrm { s } - 9 )$
B) $s ( s + 49 )$
C) $( s - 4 ) ( s - 9 )$
D) $( s + 4 ) ( s + 9 )$