In which of the following years did the poor people constitute the largest proportion of the American population

A．the poor people enjoy other benefits
B．the society as a whole is not well-off
C．the poor people may conceal their real income
D．the poor people need less money to support themselves

A．became richer
B．became poorer
C．lived a poorer life than in the seventies
D．needed more jobs to support their families