11. What are the factors for the following polynomial?

3x +9xy^3 + 12x^5


A : 3x(3y^3 + 4x^4)

B : 3xy^3(3 + 4x^4)

C : 3xy^3(7x^4)

D : 3x(1 + 3y^3 + 4x^4)




(^ means exponent )