Question

fatigue, a common temporary disability, is usually brought on by
lack of sleep.
mental strain.
overeating.
all of the above

Explanation:

Lack of sleep can lead to fatigue as the body and mind don't get proper rest. Mental strain causes the brain to be over - worked, resulting in fatigue. Overeating can make the body focus more on digestion, potentially leading to a feeling of tiredness or fatigue. So all these factors can bring on fatigue.

Answer:

D. all of the above