Which supporting detail best fits the topic sentence below? Even though researchers have studied dreams for years,
no one is quite sure why people dream at night.
A. It seems as if no one will ever find out the real reason behind our
dreams.
B. People who write about their dreams after they wake up are more
likely to remember them later.
C. We dream during a certain part of sleeping called REM.
D. A famous theory by Freud says that dreams are thoughts we didn't
know we had