
Passage: Economist: the personal income tax in the United States is a progressive tax, and the tax law is extremely complicated. People who want to pay taxes honestly often make mistakes in declaration because of misunderstandings, while people who deliberately evade taxes can always find loopholes in the tax law. Generally speaking, the space of tax avoidance is proportional to the complexity of the tax system, and the ability of tax avoidance is proportional to the level of taxpayers' income. Most of the tax avoidance space caused by the complex tax system will be used by the rich, so that the progressive tax can not reach the progressive degree stipulated in the tax law, and its function of regulation and distribution is also greatly weakened.
Question: Which of the following options, if true, provides the strongest support for the above argument of economists?
A. A.When filing tax, 60% of people in the United States need to hire professionals to do so, and 22% need to use tax filing software to help calculate.
B. B.In 1981, Americans put forward the idea of "abolishing the progressive tax rate and implementing a single tax rate".
C. C.Between 1988 and 2006, the income of the richest people in the United States rose from 15% to 22% of national income, but their average tax rate fell from 24% to 22.8%.
D. D.The Occupy Wall Street movement broke out in the United States on September 17, 2011. Demonstrators claimed that they represented 99% of the people in the United States to protest against greed, corruption and social injustice in the financial industry.
Answer: