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