Question

therefore, sleepwalkers are probably not acting out their dreams.
if sleepwalkers are not acting out their dreams, then what are they doing? why would someone get out of bed, for example, and eat a frozen pizza instead of staying in deep non - rem sleep? the truth is: no one really knows for sure. scientists have yet to figure out why people sleepwalk, but they do have a few guesses.
since most sleepwalkers are children, some scientists believe that sleepwalking is caused by extreme amounts of activity in the brain. a child’s brain develops much more quickly than an adult’s brain. children’s brains also release growth hormones during sleep. some scientists believe that these growth hormones may trigger something in the brain that causes sleepwalking.
there are also some other factors that make someone more likely to sleepwalk. sleepwalking can be genetic—this means that it can run in families. stress, lack of sleep, illness, and taking certain medications can also make someone more likely to sleepwalk.
if you or someone you know is a sleepwalker, there is probably no need to worry. sleepwalking itself is not harmful and is not a sign of any serious medical problem. however, some people do occasionally harm themselves while sleepwalking. sleepwalkers may use sharp tools, drive, fall down stairs, or do other hazardous things while they are asleep. fortunately, there are a few things that you can do in order to prevent any sleepwalking - related injuries.
first, it is important to keep a sleepwalker’s environment safe. put sharp or dangerous objects in hard - to - reach places. place gates in front of staircases. put alarms or extra locks on doors and windows. if you observe a sleepwalker, gently guide him or her back to bed. although you will not harm a sleepwalker by waking him or her up, you may frighten him or her.
which of the following facts would fit best if added to paragraph 6?
a if you have a parent, brother, or sister who sleepwalks, you are nearly ten times more likely to sleepwalk than someone who does not have a close relative who sleepwalks.
b scientists estimate that between one and fifteen percent of people sleepwalk. both males and females are equally likely to sleepwalk.
c although sleepwalkers are usually harmless, there have been a few extreme cases where people committed violent crimes in their sleep. in several such cases, sleepwalkers have been acquitted due to their somnambulant state when the crimes were committed.
d if you try talking to a sleepwalker while she is sleepwalking, she may respond, however her response may not make any sense to you.

Explanation:

To determine the best - fitting fact for Paragraph 6, we analyze the content of Paragraph 6 (which is about the genetic aspect of sleepwalking, stating that sleepwalking can be genetic and run in families). Option A states that if a person has a close relative (parent, brother, or sister) who sleepwalks, they are nearly ten times more likely to sleepwalk. This directly supports the idea that sleepwalking has a genetic component and runs in families, which is the main theme of Paragraph 6. Option B is about the general prevalence of sleepwalking among people and the equal likelihood between genders, which is not related to the genetic/family - related focus of Paragraph 6. Option C is about sleepwalkers committing crimes and being acquitted due to somnambulism, which is a different topic from the genetic basis of sleepwalking. Option D is about the response when talking to a sleepwalker, which is also not related to the genetic aspect of sleepwalking.

Answer:

A. If you have a parent, brother, or sister who sleepwalks, you are nearly ten times more likely to sleepwalk than someone who does not have a close relative who sleepwalks.