<span>The Progressive Tax is a tax that imposes a higher tax on the more wealthy.It takes a larger percentage of income from higher income than from the lower income groups, and it was based on their ability to pay. For example, the progressive tax system tax the low-income taxpayers at 10 percent, and high-income taxpayers at 30 percent. <span>
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D. A system of desktops
I think it’s C but not a 100% sure... but hopefully you get it right
Mentality /Outlook / viewpoint. Here are a few synonyms - they all fit into the space and does not change the original meaning of the sentence.