Giving 15 points, please help me.

Combine the like terms to simplify this expression. 16x + 12y^ 2 + 4a + 12x


A.28x + 12y^2 +4a

B.12y^2 + 4x + 4a

C.44 + axy^2

D.y^2 +ax + 44


I am so confused, please give me the answer but also explain why.