All of these have been implicated as playing a role in vulnerability to phobias EXCEPT:

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Quizplus · Accepted Answer

All of the choices except for D have been implicated in playing a role in vulnerability to phobias. Having close relatives with phobias suggests a genetic predisposition, excessive shyness as a child may indicate an inherited temperament or early life experiences that contribute to anxiety, and abnormalities in neurotransmitters such as serotonin and dopamine have been linked to anxiety disorders. Abnormally low levels of activity in the amygdala, however, have not been implicated in vulnerability to phobias. In fact, hyperactivity in the amygdala is more commonly associated with anxiety disorders.

All of These Have Been Implicated as Playing a Role