Question

topic: screen time
general purpose: to persuade
specific purpose: to persuade the audience to limit screen time
central idea: limiting screen time boosts sleep and focus
main points outline:
i. limiting screen time improves sleep quality.
a. subpoint
ii. limiting screen time enhances focus.
a. less screen glare sharpens attention.
select the best subpoint to support the highlighted main point.
reduced screen use saves energy costs.
fewer games improve study focus.
less blue light aids restful sleep.

Explanation:

The main point is that limiting screen - time improves sleep quality. Among the options, "Less blue light aids restful sleep" directly relates to sleep and how reducing screen - time (which emits blue light) can improve sleep, making it the most relevant sub - point.

Answer:

Less blue light aids restful sleep.