Arnett's Research Suggests That Young Adults Today Believe That Adulthood

Arnett's research suggests that young adults today believe that adulthood is primarily defined

A) by the timing of achievements,such as marriage and parenthood.
B) on the basis of reaching a certain age.
C) on the basis of achieving certain roles,such as marriage and parenthood.
D) on the basis of more subjective judgments of psychological independence.