According to Application 6

According to Application 6.1, "A Chronology of Federal Income Tax Policies":

A) the federal personal income tax has remained largely unchanged since its imposition in 1909.
B) the maximum rates on personal and corporate income taxes have fluctuated up and down over the years.
C) the maximum federal personal income tax rate has continually increased since the imposition of the tax in 1913.
D) corporate income taxes have been imposed since 1865, but personal income taxes did not come into existence until 1941.