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Author’s purpose questions ask why the text exists. The sentence links a recommended action (“replace 30 minutes of screen time with brisk walking”) to desirable outcomes (“improves mood,” “reduces resting blood pressure”). That pairing is characteristic of persuasive/behavior-change messaging (C). Option A is unsupported; there is no humorous tone. Option B would require mechanistic explanations (ATP yield, mitochondrial function), which are absent. Option D is a comparison not present in the text; the column doesn’t contrast activities, it recommends a specific substitution. On TEAS, scan for imperatives or implied directives plus benefit statements—a hallmark of persuasion. If the passage simply provided neutral facts or definitions, the purpose would be “inform.” When it pairs an action with concrete benefits to motivate change, select “persuade.” Summarize in your own words: “Walk instead of some screen time to feel better and lower BP”—this mirrors the intended purpose.