Which statement is true about eating disorders?
they often result in anxiety and difficulty sleeping through the night.
they can result in kidney damage, low blood pressure, and dehydration.
they usually develop because of a dramatic, unpleasant event in childhood.

I would go with B because most people with eating disorders usually abuse laxatives resulting in dehydration, the lack of food they eat and result in low blood pressure, and the kidney damage can be caused by the lack of food and vomiting.
 While both A and C can be common in eating disorders B is a true side effect.

Ithink the answer is c.  hope this is right and