What Was the Result of Research Done by Researchers Such

What was the result of research done by researchers such as Jerome Kagan regarding genetic factors in a child's basic temperament?

A) Children who are on the path to developing antisocial personalities readily acquire fears and are highly reactive to stress.
B) Genetic factors are involved in shyness and behavioral inhibition.
C) Genetic factors are not involved in shyness and behavioral inhibition.
D) Shy children show low responses to threats and stressors.