Studies of Family Income Over Time Reveal That

Studies of family income over time reveal that:

A) most people in the lowest quintile tend to stay there over their lifetime.
B) income mobility is rare for all quintiles of the income distribution.
C) many people who move down the income ladder are young.
D) many people who start out at the bottom of the income ladder when they are young move up the income ladder as they age and move down again when they retire.