According to research by psychologist william perry, students entering harvard university tended to have a view of the world that meant that they reasoned that something was right or wrong; people were good or bad; and others were either for them or against them. he called this

The correct answer is Dualism.

 William G.Perry considered Dualism one of the four stages of mental and moral development. The other are multiplicity, relativism and commitment. Dualism is the belief that one is going to learn what is going to be taught, without questioning, because there is a correct answer to be learned. Always relying on absolutes and authority.

the answer to your question is,

old stone age.

-mabel < 3