With respect to the symptoms of acute stress disorder, arousal is to dissociation as is to .

sleep disturbance; feeling "in a fog".

Explanation:

Acute stress disorder can be defined as a disorder which is experienced after encountering a trauma such as sudden death, threat of death, injury, etc. A person who experience such traumas is likely to develop symptoms of dissociation, anxiety, etc.

An individual who is having acute stress disorder will have symptoms of stress or arousal. Increased arousal can lead to sleep disturbances. Sleep disturbance is similar to feeling in a fog or brain fog. Brain fog is a symptom  of sleeping disorder. It causes lack of concentration power or lack of sharp memory.

Therefore, the correct answer for these fill ups are sleep disturbance; feeling 'in a fog.'

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