Which of the following explains "interactionism?" a. Rats reared in a playground have much more developed cerebral cortex than rats reared in solitude without stimulations.
b. Adopted children have personality traits much more similar to their biological parents (whom they have never seen) than to
their adoptive parents.
c. Children with "warrior genes" do not necessarily develop anti-social personality disorder (i. e., sociopath); only those who grow
up in a bad environment do.
d. Two people are interacting on a social event, and feel the connection of friendship, after that they become good friends.
e. Monozygotic twins have 100% identical genes, while dizygotic twins have 50% identical genes, no more than regular siblings.