Which of the Following Best Describes the Concept of a "Teenager

Which of the following best describes the concept of a "teenager"?

A) The concept of a "teenager" is only a theory - it has never been proven as actually existing.
B) The concept of a teenager began to appear in Western cultures about 200 years ago as a result of the industrial revolution.
C) The entire concept of being a teenager is a relatively new historical development that did not exist prior to about 60 years ago.
D) Most cultures have historically separated youth between the ages of 13 to 17 as being neither children nor adults.
E) Most primitive cultures have isolated youth between 13 to 17 as being unstable and incapable of membership in adult life. This model was adopted by modern marketers.