we have
Factory A: 2b^3– 3b^2+b-120
Factory B: 4b^2 -3b-260
To find out the company's total output
Adds A and B
so
(2b^3– 3b^2+b-120)+(4b^2 -3b-260)
Group terms
2b^3+(-3b^2+4b^2)+(b-3b)+(-120-260)
Combine like terms
2b^3+b^2-2b-380
therefore
answer option B