Which of the Following Findings Supports the Brain Development Theory

Which of the following findings supports the brain development theory of REM sleep?

A) REM sleep increases in college students during exam time.
B) Active phases of brain development are associated with low levels of REM sleep.
C) Newborn infants spend 70 percent of their sleep time in slow-wave sleep.
D) The elderly spend 85 percent of their sleep time in REM sleep.
E) Infant animals born with well-developed brains spend proportionally less time in REM sleep than do infant animals born with poorly developed brains.