Which of the following statements is correct? a. The majority of millionaires in the United States inherited their wealth. b. Fewer than three percent of families are categorized as poor for eight years or more. c. In the United States, the grandson of a millionaire is much more likely to be rich than the grandson of an average-income person. d. Most workers have about the same income (adjusted for inflation) when they are young as when they are middle-aged