Which of the Following Is True of Identical Twin Studies

Which of the following is true of identical twin studies?

A) It is clear that fraternal twins reared together are more likely than identical twins to exhibit similar behaviors.
B) The study of monozygotic twins is important because it helps us,to some extent,identify genetic versus environmental causes of behavior.
C) Even biological characteristics such as hair and eye color are somewhat influenced by environment.
D) The study of dizygotic twins is important because it helps us rule out environmental causes of behavior.