Context: Scatterplot with parabolic trend. Data peaks near $(50, 34)$, then decreases.

Answer: A) $y = -0.005(x - 50)^2 + 34$

Why: Vertex form $y = a(x-h)^2 + k$. Vertex $\approx (50, 34)$, opens downward $\rightarrow a < 0$. Only A has vertex $(50, 34)$ with negative $a$.

Traps: B swaps $h$ and $k$ to $(34, 50)$. C/D have positive $a$ (opens upward).