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The passage contrasts a popular claim with experimental evidence. The randomized study isolates two variables: filters (no effect on total sleep when bedtime constant) and earlier curfews (increased duration). Researchers add a mechanism: filters help eyes but not behavior (continued scrolling). Together, these elements support B: for sleep outcomes, when you use the device matters more than whether you toggle a filter. A overstates efficacy and contradicts the null result on duration. C ignores the demonstrated benefit of curfews. D invents harm not suggested; the text mentions a potential benefit (reduced eye strain). On Nelson–Denny inference tasks, map claims to controlled comparisons and mechanisms. The key is distinguishing physiological mitigations (blue light reduction) from behavioral drivers (usage timing). Answers that respect experimental boundaries and point toward targeted behavior change—curfews—reflect the passage’s caution against tech-solutionism without habit adjustments.