Which quotation from the text develops a central idea? A. “Too little sleep has become so common among teens that the CDC calls it an epidemic, or a widespread public-health problem.” (paragraph 2)

B. “This professional group includes more than 60,000 doctors who treat or study children. And this group has just issued a pair of papers calling for change.” (paragraph 3)

C. “The National Sleep Foundation is a nonprofit organization in Washington, D. C., devoted to sleep research.” (paragraph 6)

D. “About 100,000 car accidents each year occur when a driver is too tired to drive, according to studies of traffic reports. More than half of those drivers are under age 25.” (paragraph 17)