Which of the following is NOT one of the reasons Arnett (2006) has proposed the stage he calls emerging adulthood?

Question

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Arnett's proposed stage of emerging adulthood includes reasons such as lengthier participation in higher education, increased barriers to financial independence, and delaying marriage and parenthood until a later age. However, recent evidence indicating that the frontal cortex is not fully developed until the age of 20 is not one of the reasons proposed by Arnett.

Which of the Following Is NOT One of the Reasons