One way of looking at "barabrians" is

Barbarian is defined as a person who is savage and crude. A cannibal is an example of a barbarian. and barbaric” is most commonly used to describe an act that is either brutal or cruel to the point of savagery or primitive and uncivilized (or all of the above) while a “barbarian” is a person who commits such acts or displays such characteristics

the correct answer is individualism and exchange. at this stage, children begin to question the rules, because they can see that there is more than one side to them. different individuals have different viewpoints. they won't be able to reach this stage because of ignorance, a lack of ethics or personal biases. that is because people with that characteristiscs are not able to distinguish what is good or what is bad and they can't pursue their individual interests.

true because they can bargain