Factor: a^2 m + 5am – 30m

(A) 5m (- 6 + a + a2 )
(B) m ( a - 6 ) ( a + 5 )
(C) 5m ( a + 3 ) ( a – 2 )
(D) m ( 5a + a2 – 30 )
(E) none of these