Which of the Following Statements About the History of the Student

Which of the following statements about the history of the student worker is not true?

A) The proportion of American high school students holding part-time jobs rose dramatically during the 1970s.
B) The proportion of American high School students holding part-time jobs has decreased in the last 15 years.
C) The proportion of American High school students holding part-time jobs increased dramatically during the first decade of the twenty-first century.
D) The proportion of American high school students holding part-time jobs declined during the first four decades of the twentieth century.