Final answer:
The lowest tax bracket in the United States is 0%.
Step-by-step explanation:
The lowest tax bracket in the United States is 0% (option B). This means that individuals in this tax bracket do not pay any federal income tax on their taxable income. However, it's important to note that even though the tax rate is 0%, individuals may still be subject to other taxes such as payroll taxes or state and local taxes.
Learn more about United States tax brackets