Genetic studies of eating disorders have shown that if one identical (monozygotic) twin has anorexia, there is a chance the other will as well.

From the genetic studies concerning the eating disorders they have shown that if one of the identical (monozygotic) twin has anorexia, then there is a high chance the other will have it as well. An Eating disorder is a psychological disorder that is characterized by disturbed patterns of eating and maladaptive ways of controlling weight.

Cand d are correct because the rest are just showing your mistakes and you don’t want people who are reading a summary you wrote to see all the mistakes you made.

I’m going to go with b!