Most people pay federal income tax by:
a. paying the total amount owed by april 15.
b. filing quarterly tax payments.
c. having amounts withheld from income.
d. earning tax credits for various deductions.

Most people pay federal income tax by having amounts withheld from their income. It is usually the employer who does the computation and for deducting the amount from your pay. The employer will have to submit all of their employees' tax amounts to IRS to have it processed. In this way, the employee don't have to file it directly with IRS.

The answer would be letter C.