Which of the Following Has Not Been Cited as Evidence

Multiple Choice

Which of the following has not been cited as evidence of a genetic component in depression and other mood disorders?

A) Such disorders tend to run in families.
B) The risk of developing depression increases if a close relative has had an early onset of depression.
C) If one identical twin develops major depression, the other twin is certain to develop the disorder eventually.
D) A genetic link is stronger in bipolar disorder than in major depression.