Alice Has Been Recently Diagnosed with Generalized Anxiety Disorder

Alice has been recently diagnosed with generalized anxiety disorder. Alice was recently reunited with her identical twin that was adopted at birth and raised in a different environment. Alice is relieved that her sister at least will NOT be susceptible to this disorder. Alice is:

A) incorrect, as identical twins are more similar to each other on anxiety measures when reared apart than when reared together
B) incorrect, as identical twins are identical to each other on anxiety measures only when reared apart
C) incorrect, as identical twins are similar to each other on anxiety measures whether reared together or apart
D) correct, as identical twins are not similar to each other on anxiety measures when reared apart