Answer: (b) set at the federal level, but many states set their own minimums that are higher than the federal level
Explanation:
The minimum wage of the United States is set by the US labor law and range of state and local laws at federal level. However, many states set their own minimum wages which are usually higher than that set by the federal government. Hence, workers are paid with the highest minimum wage prescribed by federal, state, and local law.
Furthermore, twenty-nine (29) states and D.C in the United States have minimum wage higher than the federal level as of January 2020. Which is either set through legislative action or referendum in most cases