Complete the Following Sentence: Whereas Adolescence Was a New Invention

Complete the following sentence: Whereas adolescence was a new invention at the dawn of the twentieth century,

A) it heralded a return to notions of storm and stress.
B) it contributed to the defamilialization of children.
C) young adulthood is the creation of the closing of the twentieth century.
D) it was already known in earlier centuries.
E) early childhood has always been understood in the same way.