Which statement about the pricing studies is true?

• A. The initial study included participants aged 18-60, while the second study included university students aged 18-31.
• B. Both studies used the same age range of participants.
• C. The initial study used undergraduates only.
• D. The second study used participants over 50 years old.

Answer: (A)

Understanding how age ranges differ between studies helps you see how results might generalize. The true statement describes two different participant groups: the initial pricing study enrolled people aged 18 to 60, while the second pricing study used university students aged 18 to 31. This shows a broad adult sample in the first study and a narrower, student-focused sample in the second. Because of that difference in who was studied, the claim about the two samples is consistent with the provided information. The other possibilities conflict with those age ranges—for example, saying both studies used the same age range, or that the initial study used only undergraduates, or that the second study included participants over 50.