Which of the Following Statements Accurately Describes Weight Gain and Genetics

Which of the following statements accurately describes weight gain and genetics? 

A)  Obese people can change their genome and influence their epigenome. 
B)  Exercise has little, if any, effect on the genetic influence on weight gain. 
C)  Fraternal twins are more likely to weigh the same than are identical twins. 
D)  Adopted children tend to have body weights more like their biological parents than their adoptive parents. 
E)  Most cases of obesity stem from a single gene.