Choice A is the correct answer. Symmetry about the y-axis means the function is even, i.e., $f(-x) = f(x)$. This happens when the vertex is on the y-axis ($h=0$).

• A: Vertex $(0, 2)$. Symmetric.
• B: Vertex $(1, 0)$. Not symmetric.
• C: Vertex $(-0.5, -0.25)$. Not symmetric.
• D: Vertex $(-2, 0)$. Not symmetric.

Choice B is incorrect because it is shifted right. Choice C is incorrect because it has a linear term. Choice D is incorrect because it is shifted left.