Factor Completely Using the Trial and Error Method to Factor $$6 x ^ { 2 } - 21 x - 12$$

Multiple Choice

Factor completely using the trial and error method to factor trinomials. If unfactorable, indicate that the polynomial is
prime.
- $$6 x ^ { 2 } - 21 x - 12$$

A) $3 ( 2 x - 1 ) ( x + 4 )$
B) $3 ( 2 x + 1 ) ( x - 4 )$
C) prime
D) $( 6 x - 3 ) ( x + 4 )$