Severe depression that comes on suddenly or seems to have no external cause is called

Severe depression that has a sudden onset or seems not to have any external cause whatsoever is called major depression. Major depression is sometimes referred to as unipolar disorder or major depressive disorder (MDD); typical signs of MDD include persistent feeling of sadness or a lack of interest in outside stimuli.

autism affects an estimated 1 in 59 children. many people with sensory issues. these can include aversions to certain sights, sounds and other sensations.

i believe the correct answer is c