Final answer:
None of the provided domains A, B, or C perfectly match the context given in Solution 12.10, which indicates the x values lie between 65 and 75. The closest, yet still not entirely accurate, is option B. Therefore, even though not an option, a more reasonable domain based on context would be 65 <= x <= 75.
Step-by-step explanation:
To determine which is a reasonable domain for the function in Item 12, we need to understand the context of the given information. A function's domain is the set of all possible input values (x values) for which the function is defined. In Solution 12.10, it is mentioned that the x values in the data are between 65 and 75. This suggests that any domain we consider should fall within this interval. Given the options provided and the context from Solutions 11 and 17, none of the given domains, A, B, or C, are entirely reasonable, as they do not align with the interval provided in the Solution 12.10. If we had to choose one, option B) 68 < x < 80 would be the closest, although we should note that 75 should be the upper boundary, not 80. Thus, a more reasonable domain for the function would be 65 ≤ x ≤ 75 based on the given context.