What is the purpose of the phrase 'an idea many teachers have suggested for years'?

Researchers asked two groups of students to learn a list of forty word pairs in the evening. One group slept for eight hours and was tested the next morning; the other group stayed awake through the night and was tested at the same time. The group that slept recalled noticeably more pairs. The researchers do not claim that sleep is the only factor that matters. They note that the volunteers were young adults, and the results may not apply to children or older people. Still, the finding supports an idea many teachers have suggested for years: a night of sleep after studying may be more useful than extra hours of late study.

Answer and explanation

Correct answer: C. To show the finding agrees with existing advice

Answer: finding agrees with existing advice. Why not the others: It does not criticise the experiment, urge new tests or comment on students' habits.
  1. Step 1: The study 'supports' the idea.
  2. Step 2: So the phrase links new evidence to older advice.

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