A local bakery recently started using only organic ingredients for all its products. Since then, its sales have increased by 20%. Clearly, consumers are willing to pay a premium for organic baked goods. Which of the following would be most useful to determine the validity of the argument's conclusion?
✓ Correct Answer: Option B
The argument attributes the sales increase solely to the organic switch. If other bakeries also saw similar sales increases without going organic (e.g., due to a general economic upturn), it would challenge the conclusion, making Option B most useful for evaluation.