The phrase is a context clue that can help determine the meaning of the word demographic is People in the older age group. Thus box 3 is correct.
What are demographic factors?
Demographic factors refer to factors that help to identify the population of a certain location based on some elements which include, gender, age group, educational qualification, social status, and so on.
The analysis of demographic factor is important when a business is focused on designing the product for certain group of people based on their age or background. These help them to assess buyers' characteristics.
These demographic factors can be evaluated during the beginning or in between when the performance has not improved to identify the loopholes and evaluate the target audience preferences.
Therefore, in the paragraph, only Box 3 highlights the age group as a demographic factor so that will be appropriate.
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