PLEASE HELP WORTH 15 PTS!!!!1

Antonia is factoring the polynomial, which has four terms. 7x3 – 21x2 + 5x – 15 7x2(x – 3) + 5(x –3) Which is the completely factored form of her polynomial?

7x2(x – 3)
12x2(x – 3)
(7x2 + 5) (x – 3)
(12x2 + 5) (x – 3)