Based on the Example Provided by the Authors, What Is

Multiple Choice

Based on the example provided by the authors, what is the key factor that explains much of the growing inequality in wages paid to different types of workers in the U.S. since 1980?

A) Changes in the gender composition of the work force
B) Changes in the age distribution of the work force
C) Differences in computer and data analysis skills
D) Changes in the geographic concentration of workers