Factor the Expression Below Completely, If Possible $18 m ^ { 3 } n - 57 m ^ { 2 } n ^ { 2 } + 42 m n ^ { 3 }$

Multiple Choice

Factor the expression below completely, if possible $18 m ^ { 3 } n - 57 m ^ { 2 } n ^ { 2 } + 42 m n ^ { 3 }$

A) $3 m n ( m - 2 n ) ( 6 m - 7 n )$
B) $3 m n ( m + 2 n ) ( 6 m + 7 n )$
C) $3 m n ( m - 2 n ) ( 6 m + 7 n )$
D) $3 m n ( m + 2 n ) ( 6 m - 7 n )$
E) The expression is prime.