In a Classic Study of Genetic Factors in Learning,Tryon Managed

In a classic study of genetic factors in learning,Tryon managed to breed separate strains of "maze-bright" and "maze-dull" rats.Tryon's study illustrates

A) how learning takes place through classical conditioning.
B) the field of eugenics and that some behavioral characteristics are highly influenced by heredity.
C) the field of cognitive behaviorism and that some traits, such as intelligence, are learned through environmental experiences.
D) the regression toward the mean level of performance after several generations of breeding.