It was who said, "one should be capable of giving in to others, of fighting, and of keeping to oneself. the three can complement each other and make for a harmonious whole."

The answer is "Karen Horney".

Karen Horney was a German psychoanalyst who was born in 1885 and later moved to United States. She is known to have questioned some Freudian theories or to be more specific the theories related to sexuality and instinct orientation of psychoanalysis. She died in 1952.

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.