Dreams The Average Adult Spends Almost Two Full Hours Every Night

Dreams
The average adult spends almost two full hours every night dreaming. Dreams mainly occur during a period known as REM (Rapid Eye Movement) sleep. While you are in REM sleep, your brain is very active-almost as active as if you were awake. The fact that we dream most often during REM sleep is one of the very few facts about dreams that every scientist agrees on. Scientists do not know exactly which portion of the brain creates dreams or even why we have them in the first place.
One theory about their purpose is that dreaming helps the brain to organize and store memories. As your body relaxes, your brain processes all of the information it received during the day. While you sleep, your brain organizes the information into memories; your mind perceives this process as dreaming. Because your mind works differently when you are asleep than it does when you are awake, your dreams may seem confusing, illogical, or just downright silly.
Another theory is that dreams allow your mind to work out difficult problems that you encounter while you are awake. The unrealistic, free-flowing nature of dreams allows your mind to consider the problems in creative ways that you would likely never think of during your waking hours. Still, other scientists believe that dreams are random events with no real function. According to this theory, there is no actual reason for dreaming-it is simply what happens when you go to sleep.
As you can see, there is no scientific consensus about how or why we dream. There are many different theories, but no proven answers. Until then, you might as well just enjoy the fantastic nighttime adventures you get to go on without ever leaving your bed.
Question: What is the main idea of the passage?

A) Scientists agree that dreams occur during REM sleep; furthermore, there are several ideas as to why those dreams occur.
B) Adults spend on average nearly two hours each night in REM sleep, the sleep stage in which most dreaming occurs.
C) While most adults dream at night during the REM stage of sleep, the specific content of those dreams varies from person to person.
D) Some, but not all, scientists think that our dreams allow the mind to solve problems that arise during waking hours.

Correct Answer:

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