Which power is reserved for the states according to the U.S. Constitution?

The correct choice reflects the powers that are specifically reserved for the states, as outlined in the U.S. Constitution. The Tenth Amendment states that any powers not delegated to the federal government nor prohibited to the states are reserved to the states or the people.

Providing safety services, such as fire departments, is indeed a fundamental responsibility of state and local governments. This encompasses public safety measures, emergency services, and various local regulations, allowing states to tailor their services to meet the specific needs of their communities. Each state can determine how to allocate resources for safety and emergency services, thus demonstrating their autonomy in managing affairs pertinent to the well-being of their residents.

In contrast, regulating foreign trade and establishing immigration laws are powers that are primarily managed by the federal government. Printing currency is also a federal power, handled by the U.S. Department of Treasury and the Federal Reserve System. These functions require a uniform approach across the entire country, which is why they are not left to the states.