According to the Text, All of the Following Contributed to the Decline

According to the text, all of the following contributed to the decline of labor unions except

A) the growth of occupations (such as the service sector) in which labor unions were weak.
B) the growth of regions (such as the South) in which labor unions were weak.
C) increased automation that made it easier for companies to break strikes.
D) changes in labor laws that made it harder for unions to organize.
E) increased competition led companies to raise wages in an effort to persuade workers they didn't need unions.