Which Is Most Accurate About Those Who Were in the Bottom

Which is most accurate about those who were in the bottom fifth of the income distribution in 1975?

A) In 1991,about 85% of them were still in the bottom fifth of the income distribution.
B) In 1991,about 50% were still in the bottom fifth of the income distribution.
C) In 1991,about 25% were in the bottom fifth and another 25% were in the second poorest group.
D) In 1991,about 30% were in the richest fifth and another 30% were in the second richest group.