Factor the Polynomial by Grouping $$3 x ^ { 2 } + 7 x + 21 x + 49$$

Multiple Choice

Factor the polynomial by grouping.
- $$3 x ^ { 2 } + 7 x + 21 x + 49$$

A) $( 3 x + 7 ) ( 7 x + 3 )$
B) $( x + 7 ) ( 3 x + 7 )$
C) $( 3 x + 7 ) ( 3 x + 7 )$
D) prime