Which of the Following Is NOT a Strongly Supported Finding

Which of the following is NOT a strongly supported finding in research into the causes of the various anxiety disorders?

A) If one identical twin suffers from an anxiety disorder,the other is more likely to experience an anxiety disorder.
B) People's irrational and unrealistic thoughts often reinforce their avoidance of situations they believe will cause anxiety.
C) Difficult interactions with one's parents during childhood lead people to develop compulsive rituals to exert control over their life.
D) A person observes others experiencing anxiety and distress in certain situations and can imagine the same reactions for themselves.