The answer is B, 7.
[tex]\sf 8x+2y[/tex]
We can factor a 2 out of this: [tex]\sf 2(4x+y)[/tex]
[tex]\boxed{\sf 8x+7y}[/tex]
We can't factor anything.
[tex]\sf 8x+12y[/tex]
We can factor a 4 out of this: [tex]\sf 4(2x+3y)[/tex]
[tex]\sf 8x+16y[/tex]
We can factor an 8 out of this: [tex]\sf 8(x+2y)[/tex]
So your answer is B, 7.
