Which of the Following Statements Is Correct

Multiple Choice

Which of the following statements is correct?

A) The U.S. population has increased more rapidly than real GDP in recent decades.
B) Improved education and training of labor is the most important source of U.S. productivity growth.
C) The average American factory worker has about 16 years of formal education.
D) The amount of real capital used per worker has increased historically in the United States.