Answer:
D
Step-by-step explanation:
Regressive tax system is a tax system where those that earn lower income pay more tax and those that earn higher income pay less tax.
A graduated income tax is also known as progressive tax
A proportionate tax taxes everyone the same regardless of the amount earned.
A progressive tax ensures vertical equity.
A progressive tax is a tax structure where those who earn higher income are taxed more and those that earn less pay less amount of tax.