Flechsig Hypothesized That Myelination in the Brain Corresponds to the Emergence

Flechsig hypothesized that myelination in the brain corresponds to the emergence of behaviours. Although this relationship is interesting, the research must be interpreted with caution because…

A) there are empirical studies that contradict this theory.
B) the same effect has yet to be proven for the human population.
C) the results of the study are impossible to determine because the tests were done in vivo.
D) the studies are correlational.