Afederal income tax exists to provide revenue for
a. state governments
b. schools and other services
c. local governments
d. the us government

The answer is: d. the US government

this 'revenue'  is the main source of budget for the united states government to fund all of their projects.

For example, in united states, the cost for healthcare in united states approximately funded by allocating around 17% of the overall federal income tax.

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polymath; means a person   of wide-ranging knowledge or learning;

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