With Regard to Shyness, All but One of the Following

With regard to shyness, all but one of the following have been revealed. Which is the exception ?

A) Shyness may be an inborn trait, but may also develop in response to failed social interactions.
B) In different countries, people describing themselves as shy typically constitute about 20 percent of the population.
C) Many shy people isolate themselves, resulting in feelings of loneliness.
D) Shy people blame themselves when they experience failure in social interactions.