please help me on this one?

3x + 4y = 16 Subtract 4y from both sides. Put brackets around the 2 terms on the right.
3x + 4y - 4y = (16 - 4y)
3x = (16 - 4y) Divide by 3
[tex]\text{ x =}\dfrac{(16 - 4y)}{3} = \dfrac{16}{3} - \dfrac{4y}{3}[/tex]
Answer That's B.
It should be A because you are trying to solve for X