The Only Thing That Can Keep Identical Twins Reared Together

The only thing that can keep identical twins reared together from resembling each other on an attribute is nonshared environmental influences. Therefore, it makes sense that we could estimate how much nonshared environment (NSE) contributes to the attribute as follows: NSE =

A) (r _{identical twins} - r _{fraternal twins}) X 2
B) 1 - (H + SE)
C) 1 - r _{identical twins}
D) 1 - (r _{identical twins} - r _{fraternal twins})