Medical authorities recommend ____ of sleep per night as optimal,but among midlife adults in the United States,more than ____ report receiving less than 7 hours of sleep at least occasionally.
A) 5-7 hours; three-quarters
B) 6-8 hours; two-thirds
C) 7-9 hours; one-fourth
D) 9-11 hours; one-half
Correct Answer:
Verified
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