Ming Is 12,and Her Aunt Lin Has Come for a Visit.Aunt

Multiple Choice

Ming is 12,and her Aunt Lin has come for a visit.Aunt Lin is using the spare bed in Ming's room.Several times during the night,Aunt Lin awakens briefly and then falls back to sleep.Ming doesn't awaken at all during the night.Which research result best explains this difference in sleep patterns

A)  During adulthood, the proportion of REM sleep gradually declines. 
B)  The elderly are more affected by jet lag and shifts in their circadian rhythms. 
C)  During adulthood, the proportion of slow-wave sleep increases significantly. 
D)  During adulthood, the proportion of slow-wave sleep gradually declines.