Choice A is the correct answer. Check for constant ratios.

1. Table X: Ratios $\frac{150}{100} = 1.5$ and $\frac{225}{150} = 1.5$ (constant) → Exponential ✓
2. Table Y: Differences $150-100=50$ and $200-150=50$ (constant) → Linear ✗
3. Conclusion: Only Table X is exponential.

💡 Strategic Tip: Exponential = constant ratio. Linear = constant difference.

Choice B is incorrect because Table Y is linear. Choice C is incorrect because only one is exponential. Choice D is incorrect because Table X is exponential.