Answer: Distribution of age

**Explanation:** - **Option A (Lifestyle):** Incorrect because lifestyle changes are driven by societal influences, such as shifts in work habits, leisure activities, and spending patterns. These factors impact industry sales but are not demographic in nature. - **Option B (Distribution of age):** Correct because demographic influences include changes in population characteristics like age and gender distribution. These changes significantly affect economic growth and the demand for specific goods and services. - **Option C (Spending behavior):** Incorrect because spending behavior is influenced by societal trends, such as how people allocate their income and leisure time. Like lifestyle, this is not a demographic factor.

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