Question

teenagers who dont get enough sleep at higher risk for mental health problems
tori rodriguez • 2015
many studies have examined the effects of sufficient versus insufficient sleep on mental health. a new study, published in february in the journal of youth and adolescence, takes a more nuanced look, attempting to determine just how much each hour less per night really costs -- where teenagers are concerned.

1. multiple choice: what is the main idea of paragraph 1?

a researchers led several studies to explore why teenagers do not get enough sleep.

b researchers conducted a new study to determine how lack of sleep affects teenagers.

c researchers made recommendations that would help teenagers sleep better at night.

× researchers want to explore solutions that can help improve the mental health of teens.
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Explanation:

To determine the main idea of paragraph 1, we analyze each option:

• Option A: The paragraph is not about why teenagers don't get enough sleep, but about the effects of sleep duration on mental health and a new study's focus on how much each hour less of sleep costs teenagers. Eliminate A.
• Option B: The paragraph states that many studies examined sleep effects on mental health, and a new study (in February, Journal of Youth and Adolescence) aims to determine how much each hour less of sleep at night affects teenagers. This matches the content of the paragraph.
• Option C: The paragraph does not mention recommendations to help teenagers sleep better. Eliminate C.
• Option D: The paragraph is about the impact of sleep (or lack thereof) on teenagers' mental health, not about exploring solutions to improve mental health. The new study is about quantifying the cost of each hour less of sleep, not about solutions for mental health. Eliminate D.

Answer:

B. Researchers conducted a new study to determine how lack of sleep affects teenagers.