Several research studies were conducted by Mary Carskadon and her colleagues on the sleep patterns of U.S. adolescents. They concluded from the studies that
A. older adolescents tend to be sleepier during the day than younger adolescents.
B. adolescents being sleepy during the day was a result of academic work and social pressures.
C. early school starting times are conducive to the sleep patterns of older adolescents but not to those of younger adolescents.
D. when given the opportunity, adolescents will sleep an average of 7 hours a night.
Answer: A
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