An Examination of the Quintile Distribution of Before-Tax Household Income

An examination of the quintile distribution of before-tax household income data for 1980 and 2015 given in the table suggests a trend of

A) greater equality in the distribution of income over the period.
B) greater inequality in the distribution of income over the period.
C) rising income levels for the upper-income groups.
D) falling income levels for the lower-income groups.