Answer: B. Educational attainment is one of the fault lines between money-based and lifestyle-based definitions of the middle class. Most theorists claim that a college degree -- or even a graduate degree -- are necessary for membership in the group. The Census Bureau, on the other hand, notes that the median household headed by someone with an associate's degree makes $55,928 per year -- almost $6,000 more than the median household. As for households headed by college graduates, their median income is $83,985. In other words, according to the Census Bureau, it doesn't take a four-year college diploma to live the middle-class dream.