1
part a: which statement best expresses the central idea of the text?

a. people have different dreams for different reasons, making it difficult for scientists to answer the question “why do humans dream? ”
b.
most of the theories that scientists have about dreams show their benefits; however, there are no concrete conclusions for why humans dream
c.
scientists struggle to understand why people dream as there is currently no way to see what goes on in the brain when someone sleeps.
d.

since humans are the only creatures that dream, scientists believe that dreaming is an important part of humans’ advanced intelligence.