Which of the Following Statements About Social Mobility in the United

Which of the following statements about social mobility in the United States is accurate?

A) Those of the middle-income class have seen the greatest rise in social mobility in the past 40 years.
B) Those employed in manufacturing-sector jobs have seen the greatest rise in social mobility.
C) Social mobility has increased for the poorest fifth of Americans, but not for middle-income Americans.
D) A person born into the poorest fifth of Americans has a better chance now of ending up in the highest fifth than forty years ago.
E) Social mobility has become more difficult to achieve over the past forty years or so.