Choice A is the correct answer. Check the coordinates.

1. Observe: Both points have an x-coordinate of 1.
2. Conclusion: Since $x$ is always 1, the equation is $x = 1$. This is a vertical line.
3. Slope Check: $\frac{-5 - 3}{1 - 1} = \frac{-8}{0}$ (Undefined), confirming it's vertical.

💡 Strategic Tip: If the x-coordinates are the same, it's $x = k$. If y-coordinates are the same, it's $y = k$.

Choice B is incorrect because$y$ values change. Choice C is incorrect because it only fits one point. Choice D is incorrect because x is 1, not 3.