Which of the Following Statements Is Incorrect

Which of the following statements is incorrect?

A) During the 1920s, it was widely assumed that the federal government would play a small role in our lives.
B) From the 1930s to the 1970s, it was generally believed that the federal government should try to solve social and economic problems.
C) Reagan sought to reverse the trend of expanding governmental power.
D) No simple theory of politics is likely to explain both the growth and cutback of federal power.
E) None of the above