Which of the Following Results of Research Studies on Children's

Multiple Choice

Which of the following results of research studies on children's sleep is true?

A) Preschool children with a short sleep duration were more likely to have better social skills than others.
B) Attention problems in early adolescence were independent of sleep problems in early childhood.
C) In 2- to 5-year-old children, each additional hour of daily screen time was associated with a decrease in sleep time.
D) In a Chinese study, preschool children who used electronic devices 3 or more hours per day had long sleep durations.