Ava and Bella Are Identical Twins

Ava and Bella are identical twins. They were adopted at birth by different families and raised in different environments. How are any similarities between Ava and Bella informative for developmental psychology, if indeed they are?

A) Their similarities reflect the influence of "nature" on development.
B) Their similarities reflect the influence of "nurture" on development.
C) Their similarities reflect the influence of a complex interaction between "nature" and "nurture" on development.
D) Their similarities are not especially informative for developmental psychology.