How Has the Share of the Personal Income Tax Paid

How has the share of the personal income tax paid by the top 1 percent of earners and the bottom half of earners changed during the last four decades?

A) The top 1 percent now pay a larger share and the bottom half of earners pay a smaller share of the personal income tax.
B) The top 1 percent now pay a smaller share and the bottom half of earners pay a larger share of the personal income tax.
C) The share of the personal income tax paid by the top 1 percent increased between 1960 and 1980, but the share of the revenues collected from the top 1 percent has declined sharply since 1980.
D) The relative shares paid by the top 1 percent and the bottom half of earners have been virtually unchanged during the last four decades.